Features of Skype

Last updated
Part of a series on
Skype

mobile applications

Skype offers a number of features based around calling (both free and paid), messaging (including instant, voice and text messaging (SMS)), video chat, and file and screen sharing. [1] The following is a partial list of Skype's features:

Contents

Instant messaging and chat history

Skype allows users to send instant messages to other users in their contact list. Messages sent to offline users are stored on Skype servers and will be delivered to their recipients as soon as they come online on Skype. Chat history along with the message status will be synchronized across all user devices supported by Skype whenever the user signs in with the same Skype account.

Although Skype allows sending SMS messages, it is not possible to receive SMS messages on Skype so users need a different way to receive responses to the messages they send using Skype. This has been a cause of angst among user who purchase Skype as an alternative to a mobile phone because Microsoft will not refund any purchases even for users who discover this missing feature only after purchasing multi-year contracts. Other than in user complaints on the Microsoft Skype forums, there is no mention on Microsoft or Skype websites that when they say "Send SMS messages," that is just what they mean: users can send but they cannot receive SMS messages.

Chat history

Skype keeps user instant messaging history on user's local computer, and on Skype's cloud for 30 days. [2] Users cannot control how long their chat histories are stored on Skype's servers but can configure that option individually for every their device. [2] [3] Once user signs into Skype on a new device the conversation history is synced with Skype's cloud and stored locally. Skype allows users to remove or edit individual messages during one hour after sending; this affects messages already received by chat interlocutors as well as not delivered to them yet. Skype allows users to delete all saved conversation histories for the device.

Emoticons and formatting

Users can send about 254 emoticons that are displayed either statically or animated, depending on user's settings. There are also hidden emoticons, 241 flags and 63 other. On special occasions, Skype introduces featured emoticons that are later either left as standard (anger), left as hidden (mooning) or removed (captain). [4] Sending an empty message is not possible.

Formatting text is possible: *text* creates bold text, _text_ creates italic text, {code} text {code} applies monospace font and ~text~ creates strikethrough text. Writing @@  at the beginning of a message will disable any formatting in the message. [5] Placing two exclamation points and a space (!! ) at the beginning of a message will send the entire message in monospace font. [6] A more convenient way to disable formatting for small pieces of text, is to use ```text``` instead of {code}text{code}. [7] Turning off formatting permanently can be achieved with the command /wikimarkup off.

Quoting

Users are able to quote other messages by copying them and pasting them into a new message. A quote shows the message, the original sender, and the timestamp of the original message. The feature is seen as controversial and often useless because people have found ways to create custom quotes.

Calls between Skype and landline / mobile phone numbers

Skype users can call landline and mobile phone numbers (previously known as SkypeOut) using Skype Credit or a calling subscription. Additionally, users can purchase a Skype Number (previously called SkypeIn and Online Number) that lets contacts call their Skype client from a landline or mobile phone.

Outgoing calls

The ability to call landline or mobile phones from Skype was originally branded as SkypeOut, but this term has been dropped in favor of Calls to mobiles and landlines. Skype users can call phone numbers, including landline and mobile phones, for a fee using prepaid Skype Credit or a subscription (see below). This fee can be as low as US$0.02 per minute for most developed countries, and as high as US$6.80 per minute for calls to the Inmarsat numbers.

In January 2007, Skype introduced a €0.03 connection fee for each call that connected to a landline or mobile number. [8]

After 180 days of inactivity, a user's Skype Credit balance is deactivated; however, it can be reactivated.

Subscription calling plans

On 19 December 2006, Skype announced that there would be a new pricing structure in 2007. Details of a new scheme were released 18 January 2007. The initial press release was vague about the new scheme, but it did reveal that there may be a new connection fee. [8]

In January 2007, Skype launched Skype Pro, a prepaid unlimited call subscription for calls that were made inside North America. Skype's unlimited calling offers unlimited calls to anyone, on any phone, within the U.S. and Canada, for a one-time (e.g. annual) fee. As of April 21, 2008, Skype Pro was replaced by new calling subscription plans, which don't require the calls to start from a certain country. [9]

Skype offers several monthly plans that it calls unlimited. However, Skype limits these subscriptions to 10,000 minutes per month, 6 hours per day, and 50 telephone numbers per day. If one of these limits is exceeded, any additional calls are billed at regular rates and connection fees if the user has Skype Credit. [10]

Skype To Go numbers

Users can set up a Skype To Go number which allows them to reach international phones numbers dialled from any landline or mobile. Skype provides a local number (the user chooses the area code) that then connects using Skype Credit to the number in another country. The service also provides the opportunity to dial any number abroad as well. [11]

Toll-free numbers

Calls to most toll-free numbers in Australia (+61 1800), Austria (+43 800), Estonia (+372 800) France (+33 800, +33 801, +33 803, +33 805, +33 806, +33 808, +33 809), Germany (+49 800), the Netherlands (+31 800), Poland (+48 800), Spain (+34 900), Taiwan (+886 801, +886 811), the UK (+44 500, +44 800, +44 808), United Nations (+888) and the United States (+1 800, +1 822, +1 833, +1 844, +1 855, +1 866, +1 877, +1 888) are free for all Skype users. [12]

Support for toll-free numbers in Canada was effectively removed in January 2012.

Emergency numbers

Skype also does not support calling emergency numbers such as 1-1-2 in Europe or 911 in the United States, however they do support this service in Australia, Denmark, Finland, and the United Kingdom. [13]

Caller ID for outgoing calls

Skype offers a feature allowing users to set the caller ID for outgoing calls to telephone numbers. Set-up verification involves sending an SMS text message to a selected mobile phone number, then typing that verification code into a web form. Since most regular home and business telephones cannot receive text messages, this feature is only available to owners of mobile phones.

Incoming calls

Skype Number

Skype Number (formerly called Online Number and until 2010 named SkypeIn) allows a Skype user to receive calls to their Skype client (on whatever device) dialed from mobiles or landlines to a Skype-provided phone number. The number need not be in the same location as the user. For example, a user in San Francisco could create a local telephone number in London. Callers in London could then make a local call to reach that user (who answers on Skype in San Francisco).

Skype offers numbers in Australia, Chile, [14] Denmark, Estonia, Finland, France, Germany, Hong Kong, Hungary, Ireland, Italy, Republic of Korea, Malta, Mexico, Netherlands, New Zealand, [14] Poland, Romania, [14] South Africa, Sweden, Switzerland, the United Kingdom, and the United States.

In Russia some companies, including SIP operators, provide direct numbers, redirecting calls to Skype.

Skype Premium

Skype Premium originally bundled together a number of Skype's features including the selection of a calling subscription, the ability to make group video calls and the ability to screen share with up to 10 other people (person-to-person video calls are free), improved customer support and the removal of ads from the Skype client. However, the Premium product was removed in the summer of 2014 when group video calls and screen sharing were made free. [15]

Voicemail

Skype Voicemail (now called Voice messaging) was released on March 10, 2005. This service allows callers to leave voicemail messages for Skype users who are indisposed. Leaving voicemail messages became a free service in 2012.

Video calling and screen sharing

Skype 2.0 and later, on Microsoft Windows (DirectX 9.0 or above required), Mac OS X, and Linux, supports video calling for Skype-to-Skype calls between two parties. Skype 3.6 and later on Windows and Skype 5.3 and later on Mac supports 720p high-definition video. Skype 5.8 and later on Windows and Skype 5.5 for Mac support 1080p high-definition video with the Logitech C920 webcam as well as the primary use of H.264 video codec instead of VP8 found in past versions. Skype 3.0.0 on iOS allows iPhone, iPad and iPod Touch users to call each other, as well as Windows, Linux and Mac OS X. [16] Skype 5 supports group video calls. [17] Sharing of external monitors is also supported via third party hardware. [18]

In 2019, Skype added an option to blur the background using A.I. algorithms purely done using software, despite a depth sensing camera not being present in most webcams. [19]

SMS text messaging

Like many other instant messaging services, Skype clients can send SMS text messages to mobile phone numbers. In the United States, China, and Taiwan, Skype uses a "generic, pre-defined number" as the sender ID. In other countries, the message can be set to appear coming from a verified mobile number, allowing recipients to reply, or else show the first 11 characters of the Skype username. However, as of March 2015, Skype users cannot receive SMS, despite a continuing series of requests and complaints.

Costs are generally lower than standard SMS charges; for example Skype's UK rate per SMS message including VAT is 6.4p, compared to standard rates of 10p or 12p[ citation needed ]; for international SMS costs will be significantly cheaper using Skype.

Wireless hotspot network access

Skype WiFi (previously called Skype Access) allows users to pay a per-minute charge for Internet access at commercial wireless hotspots using Skype Credit. [20] As of May 2010, Skype lists more than 100 participating networks. This replaced an earlier feature Skype Zones Beta which provided subscription-based access at wireless hotspots operated by Boingo and The Cloud. [21] [22]

In February 2017, Microsoft announced plans to discontinue its Skype Wi-Fi service globally. The application will be delisted, and the service itself will no longer function after March 31, 2017. [23] [24]

Application features

Skype Click to Call (formerly called the Skype Web Toolbar) recognizes phone and Skype Numbers, and is available for Internet Explorer, Google Chrome, and Mozilla Firefox on Windows. [25] Such numbers on web pages are replaced with an icon that can be clicked to call the number using Skype, or right-clicked to provide further options, such as adding the number to Skype's list of contacts. The feature detects phone numbers automatically, but a web site developer can override the detection algorithm using a Meta element and mark the valid numbers individually.

A log file is created for each contact on a user's contact list. Log files are stored locally, meaning they are not available if a user switches computers. By default, the option to log conversations is disabled, but can be enabled in the tools / privacy panel.

On Windows, Skype can be run directly from a USB flash drive without being installed on the host computer. [26] On Mac OS X, installation on the host computer is not required.

In December 2017, Microsoft added "Skype Interviews", a shared code editing system for those wishing to run job interviews for programming roles. [27] [28]

Discontinued features

Skype chat

Skype supports group text chat with an interface similar to IRC with up to 150 people.

The Macintosh version used to use the same message view style format as Adium, though with a different filename extension. Message view styles made for Adium could be installed for Skype, and they did not even need to be renamed. [29] There were a couple of cosmetic bugs, [30] but ignoring those, Adium styles worked without modification. This feature is not present in the Windows, Linux, and Pocket PC versions of Skype. This feature has been discontinued starting with Skype 2.7.0.49.

Not Available status

Since Skype 4, the "Not Available" status is supported. This status was removed in Skype 5.

Most Skype versions, including version 4, broadcast a status of "Not Available" after a configured idle time, but Skype 4 no longer allows the user to edit this setting. The only way for the user to configure this idle time setting is to edit the IdleTimeForNA setting in the config.xml file. Since this feature was removed in Skype 5, the edit setting no longer exists in the config.xml file.

Skype 5 and above display other users' "Not Available" status as "Away".

SkypeMe! status

Skype let users set their presence indicator to "SkypeMe!" in earlier versions of Skype software. It invited calls from strangers. Setting one's status to SkypeMe! attracts a number of callers who want to practice a foreign language (usually English), in addition to the expected scammers and spammers. [9] This feature has been hidden from being selectable starting with Skype version 4 and removed completely in version 5. Setting your privacy settings to "allow anyone to contact me" essentially does the same thing minus the presence indicator itself.

Skypecasts

Skypecasting was released on May 3, 2006. Skypecasts were live, moderated conversations allowing groups of up to 100 people to converse, moderated by the "host" who was able to control who was able to speak. The "host" would always remain in control, and could invite people into the speaking area. There was the functionality to mute and eject, both speakers and listeners, or add more people to speak from the listener section. Skypecasts did not support chat windows to share text information (such as URL) with participants. The Skypecast feature was removed in 2008. [31]

Skype Prime

Skype Prime was a beta feature in Skype 3.1. It allowed users to call lines that charged a per minute rate usually for advice on a particular topic. The feature has since been discontinued in later versions of the Windows and Mac clients.

SkypeFind / business directory

SkypeFind was a community-generated directory of business reviews in Skype 3.1. [32] The feature was removed [ clarification needed ] Skype for Windows 4.x client. The business directory replaced SkypeFind but has also been discontinued from version 5.x of the Windows client.

Earlier Skype versions allowed the user to search the Skype directory for random people to talk to. This feature was effectively discontinued since Skype 4.0. In current Skype releases you can only add contacts for which you know one of the following pieces of information: e-mail address, phone number, full name, or Skype name.

See also

Related Research Articles

<span class="mw-page-title-main">AIM (software)</span> Instant messaging service

AIM was an instant messaging and presence computer program created by AOL, which used the proprietary OSCAR instant messaging protocol and the TOC protocol to allow registered users to communicate in real time.

<span class="mw-page-title-main">SMS</span> Text messaging service component

Short Message/Messaging Service, commonly abbreviated as SMS, is a text messaging service component of most telephone, Internet and mobile device systems. It uses standardized communication protocols that let mobile devices exchange short text messages. An intermediary service can facilitate a text-to-voice conversion to be sent to landlines.

<span class="mw-page-title-main">Instant messaging</span> Form of communication over the internet

Instant messaging (IM) technology is a type of online chat allowing real-time text transmission over the Internet or another computer network. Messages are typically transmitted between two or more parties, when each user inputs text and triggers a transmission to the recipient(s), who are all connected on a common network. It differs from email in that conversations over instant messaging happen in real-time. Most modern IM applications use push technology and also add other features such as emojis, file transfer, chatbots, voice over IP, or video chat capabilities.

Trillian is a proprietary multiprotocol instant messaging application created by Cerulean Studios. It is currently available for Microsoft Windows, Mac OS X, Linux, Android, iOS, BlackBerry OS, and the Web. It can connect to multiple IM services, such as AIM, Bonjour, Facebook Messenger, Google Talk (Hangouts), IRC, XMPP (Jabber), VZ, and Yahoo! Messenger networks; as well as social networking sites, such as Facebook, Foursquare, LinkedIn, and Twitter; and email services, such as POP3 and IMAP.

<span class="mw-page-title-main">Skype</span> Telecommunications software service/application

Skype is a proprietary telecommunications application operated by Skype Technologies, a division of Microsoft, best known for VoIP-based videotelephony, videoconferencing and voice calls. It also has instant messaging, file transfer, debit-based calls to landline and mobile telephones, and other features. Skype is available on various desktop, mobile, and video game console platforms.

<span class="mw-page-title-main">Google Talk</span> Instant messaging service

Google Talk was an instant messaging service that provided both text and voice communication. The instant messaging service was variously referred to colloquially as Gchat, Gtalk, or Gmessage among its users.

<span class="mw-page-title-main">Skype Technologies</span> Subsidiary of Microsoft, which develops Skype

Skype Technologies S.A.R.L is a telecommunications company headquartered in Luxembourg City, Luxembourg, whose chief business is the manufacturing and marketing of the video chat and instant messaging computer software program Skype, and various Internet telephony services associated with it. Microsoft purchased the company in 2011, and it has since then operated as their wholly owned subsidiary; as of 2016, it is operating as part of Microsoft's Office Product Group. The company is a Société à responsabilité limitée, or SARL, equivalent to an American limited liability company.

<span class="mw-page-title-main">Skype for Business</span> Enterprise instant messaging and video conferencing software by Microsoft

Skype for Business is an enterprise software application for instant messaging and videotelephony developed by Microsoft as part of the Microsoft Office suite. It is designed for use with the on-premises Skype for Business Server software, and a software as a service version offered as part of Microsoft 365. It supports text, audio, and video chat, and integrates with Microsoft Office components such as Exchange and SharePoint.

<span class="mw-page-title-main">Windows Live Messenger</span> Deprecated instant messaging client

MSN Messenger, later rebranded as Windows Live Messenger, was a cross-platform instant-messaging client developed by Microsoft. It connected to the Microsoft Messenger service and, in later versions, was compatible with Yahoo! Messenger and Facebook Messenger. Versions were developed for Windows, Xbox 360, Mac OS X, BlackBerry OS, iOS, Java ME, S60 on Symbian OS 9.x, MSN TV, Zune HD, Windows Phone, Windows Mobile and Windows CE.

<span class="mw-page-title-main">Jaxtr</span>

Jaxtr was a social communications company that melds together global calling, SMS, and social networking. Founded by Phillip Mobin and Touraj Parang in October 2005, jaxtr uses Voice over Internet Protocol to offer competitive rates as well as free international and long distance calling. Some key differentiators for jaxtr in its market include allowing phone-to-phone calls to and from any mobile and landline phones, offering social networking focused on voice, requiring no software downloads or access pins, and giving users local Direct Inward Dialing (DID) phone numbers. Offered in 56 countries, these numbers allow users in those countries to dial a local phone number which would ring a long distance or international destination phone. Jaxtr also offers users a set number of global SMS messages each month.

Founded in 2008, Voxofon develops mobile apps and communication services that utilize over-the-top (OTT) voice and messaging technologies for smartphones, tablets, and web applications. Voxofon enables free app-to-app domestic and international calls and texts, as well as provides the option for users to make international calls and texts to friends and family that use feature phones or landlines. The Voxofon app is a cross-platform application that is supported on iPhone, iPod Touch, iPad, Android, Blackberry, Windows Phone, and through any web browser.

Viber, or Rakuten Viber, is a cross-platform voice over IP (VoIP) and instant messaging (IM) software application owned by Japanese multinational company Rakuten, provided as freeware for the Google Android, iOS, Microsoft Windows, Apple macOS and Linux platforms. Users are registered and identified through a cellular telephone number, although the service is accessible on desktop platforms without needing mobile connectivity. In addition to instant messaging it allows users to exchange media such as images and video records, and also provides a paid international landline and mobile calling service called Viber Out. As of 2018, there are over a billion registered users on the network.

<span class="mw-page-title-main">Messenger (software)</span> American instant messaging app

Messenger is an American proprietary instant messaging app and platform developed by Meta Platforms. Originally developed as Facebook Chat in 2008, the company revamped its messaging service in 2010, released standalone iOS and Android apps in 2011, and released standalone Facebook Portal hardware for Messenger calling in 2018. In April 2015, Facebook launched a dedicated website interface, Messenger.com, and separated the messaging functionality from the main Facebook app, allowing users to use the web interface or download one of the standalone apps. In April 2020, Facebook released a Messenger desktop app for Windows and macOS.

<span class="mw-page-title-main">ChatON</span> Mobile communication service

ChatON was a global mobile communication service introduced by Samsung Electronics in September 2011. ChatON served more than 120 countries in 62 languages. ChatON was available on Android, iOS, BlackBerry, Windows Phone, Windows Mobile (Korea), and Bada smartphones. Additionally, a web client was offered for access to the service via web browsers. Users could invite and register buddies via Facebook and Twitter as well as share ChatON content on Facebook. Among ChatON's unique features were allowing users to create Animation messages, Broadcast to send personal notices in a group chat room, and the Trunk which stores media files shared in chats. When a user logs in ChatON, the user's buddy list is available on any connected device.

Microsoft mobile services are a set of proprietary mobile services created specifically for mobile devices, they are typically offered through mobile applications and mobile browser for Windows Phone, | platforms, BREW, and Java. Microsoft's mobile services are typically connected with a Microsoft account and often come preinstalled on Microsoft's own mobile operating systems while they are offered via various means for other platforms. Microsoft started to develop for mobile computing platforms with the launch of Windows CE in 1996 and later added Microsoft's Pocket Office suite to their Handheld PC line of PDAs in April 2000. From December 2014 to June 2015, Microsoft made a number of corporate acquisitions, buying several of the top applications listed in Google Play and the App Store including Acompli, Sunrise Calendar, Datazen, Wunderlist, Echo Notification Lockscreen, and MileIQ.

<span class="mw-page-title-main">Google Hangouts</span> Communication software by Google

Google Hangouts was a disconnected cross-platform instant messaging service developed by Google. It originally was a feature of Google+, becoming a standalone product in 2013, when Google also began integrating features from Google+ Messenger and Google Talk into Hangouts. Google then began integrating features of Google Voice, its Internet telephony product, into Hangouts, stating that Hangouts was designed to be "the future" of Voice.

Messagenet S.P.A. is a company based in Milan, Italy, that develops and sells VoIP and internet fax services. The company claims to have more than 500,000 registered users, 400,000 telephone numbers assigned, more than 7 million minutes of conversation and two and a half million faxes processed per month. Messagenet is a sister company of KPNQwest Italia.

<span class="mw-page-title-main">Upptalk</span> Proprietary voice-over-IP service and software application

Upptalk was a proprietary voice-over-IP service and software application that provided mobile phone numbers in the cloud and allows users to call or text any phone for free whether or not the device receiving the calls and texts has the Yuilop application. The service was discontinued in 2017 and even its domain was abandoned.

<span class="mw-page-title-main">SOMA Messenger</span> Instant messaging software

SOMA Messenger is a cross-platform instant messaging and communication application that specializes in video calls and voice calls for smartphones. Users can also send each other text messages, emoticons, images, videos, voice messages, contacts, user location, as well as create group chats, group video calls and conference calls.

Comparison of user features of messaging platforms refers to a comparison of all the various user features of various electronic instant messaging platforms. This includes a wide variety of resources; it includes standalone apps, platforms within websites, computer software, and various internal functions available on specific devices, such as iMessage for iPhones.

References

  1. ↑ "Skype". Skype. Retrieved October 5, 2014.
  2. 1 2 "Where can I find my conversation history in Skype for Windows desktop and what can I do with it?". Skype. Retrieved November 7, 2014.
  3. ↑ "How do I see my chat history in Skype for Mac OS X?". Skype. Retrieved November 7, 2014.
  4. ↑ "Captain America". Skype Emoticons. Skype.rs. Retrieved 7 August 2016.
  5. ↑ "How do I send an instant message in Skype for Windows Desktop?". Skype. Retrieved 7 August 2016.
  6. ↑ ruwim. "Color Chat" . Retrieved 7 August 2016.
  7. ↑ "Formatting Skype messages". 25 April 2016.
  8. 1 2 "What are Skype Connection Fees and How do They Affect Skype Rates?". About.com. Archived from the original on October 6, 2014. Retrieved October 5, 2014.
  9. 1 2 "Why are some features not available in Skype anymore?". Skype Support. Retrieved October 5, 2014.
  10. ↑ "Skype Fair Usage Policy". Skype. Retrieved October 5, 2014.
  11. ↑ "Skype To Go". Skype. Retrieved October 5, 2014.
  12. ↑ "How do I dial toll free numbers (for example, +1 800, +1 866)". Skype. Retrieved October 5, 2014.
  13. ↑ "Skype Emergency Calling". Skype. Retrieved June 9, 2017.
  14. 1 2 3 Villu Arak. "Four new SkypeIn countries". Skype Blogs. Archived from the original on 2007-09-02. Retrieved 2007-08-13.
  15. ↑ "Premium is changing its look". Skype . Retrieved 3 October 2014.
  16. ↑ "SkypeGarage/SkypeForWindowsExperimental/HighQualityVideoCalls - Skype Developer Zone". Archived from the original on 2009-12-23. Retrieved 2007-06-30.
  17. ↑ "Group video calling - Skype". Archived from the original on 2013-02-02. Retrieved 2017-02-27.
  18. ↑ "How to Use Skype to Broadcast a VGA, DVI, or HDMI signal" . Retrieved 2011-07-04.
  19. ↑ [Introducing background blur in Skype https://blogs.skype.com/news/2019/02/06/introducing-background-blur-in-skype/]
  20. ↑ "Skype WiFi". Skype. Archived from the original on October 6, 2014. Retrieved October 5, 2014.
  21. ↑ Fitzgerald, Thomas J. (September 1, 2005). "How to Make Phone Calls Without a Telephone". The New York Times.
  22. ↑ Smith, Tony. "The Cloud touts Skype Zones support". The Register.
  23. ↑ Ingrid Lunden (28 February 2017). "Skype is killing off its WiFi service March 31 to focus on 'core' features". TechCrunch. Retrieved 1 March 2017.
  24. ↑ "Is Skype WiFi being discontinued?". Skype Support. Retrieved 1 March 2017.
  25. ↑ "What is Skype Click to Call?". Skype. Retrieved October 5, 2014.
  26. ↑ "Run Skype from your thumb drive". LifeHacker. 20 January 2009. Retrieved October 5, 2014.
  27. ↑ "Skype adds real-time code editor to interview programmers". Linux Edge. 25 December 2017.
  28. ↑ "Skype's 6 tips to rock an online interview | Skype".
  29. ↑ "Adding chat styles to Skype". domainofthebored.blogspot.com. Retrieved 2006-06-13.
  30. ↑ "Adium message styles and Skype (1 updates)". Soeren Says. Archived from the original on 2006-03-27. Retrieved 2006-06-13.
  31. ↑ "Skype shuts down Skypecasts". Gigaom. 20 September 2008. Retrieved October 5, 2014.
  32. ↑ "What is SkypeFind?". Skype. Archived from the original on October 6, 2014. Retrieved October 5, 2014.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.