A letter of thanks, letter of gratitude, thank you card, or thank you letter is a letter or greetings card that is used when one person/party wishes to express appreciation to another. They are frequently sent after an event (a birthday party, a religious festival or holiday) and especially when a gift has been received.[ citation needed ]> Personal thank-you letters and cards are often hand-written and the addressee is typically a friend, acquaintance or relative. Letters of gratitude are usually written as formal business letters, either to a client, a supplier, an employer (or prospective employer after an interview) [1] or an employee as part of creating an engaged workforce.[ citation needed ]
Some psychological research indicates that expressing gratitude by writing such letters can have emotional benefits, [2] but this does not apply to all circumstances. [3] News media have covered the tradition of handwritten letters of thanks from a cultural perspective, suggesting in particular that the extra effort represented by handwriting (as opposed to text messaging, for example) makes these letters more emotionally significant for sender and recipient alike. [4] [5]