A rapporteur is a person who is appointed by an organization to report on the proceedings of its meetings. The term is a French-derived word.
For example, Dick Marty was appointed rapporteur by the Parliamentary Assembly of the Council of Europe to investigate extraordinary rendition by the CIA.
The rapporteur is an eminent role in the legislative process of the European Parliament (EP). They are a Member of the European Parliament (MEP) responsible for handling a legislative proposal – both procedurally and with regard to its substance – on behalf of the European Commission, the Council of the European Union or the EP.  Based on the relevant proposal, the rapporteur is appointed by the relevant Committees of the European Parliament charged with drawing up a legislative recommendation for the EP to vote on. The rapporteur, therefore, has a substantial influence in the process leading to the adoption of EU-legislation. 
Their key functions are:
Political groups within the committee in charge of drafting a legislative recommendation may appoint a shadow rapporteur to represent their views. 
The Council of the European Union, often referred to in the treaties and other official documents simply as the Council, and informally known as the Council of Ministers, is the third of the seven Institutions of the European Union (EU) as listed in the Treaty on European Union. It is one of two legislative bodies and together with the European Parliament serves to amend and approve or veto the proposals of the European Commission, which holds the right of initiative.
The European Parliament (EP) is one of the legislative bodies of the European Union and one of its seven institutions. Together with the Council of the European Union, it adopts European legislation, following a proposal by the European Commission. The Parliament is composed of 705 members (MEPs). It represents the second-largest democratic electorate in the world, with an electorate of 375 million eligible voters in 2009.
The European Committee of the Regions (CoR) is the European Union's (EU) assembly of local and regional representatives that provides sub-national authorities with a direct voice within the EU's institutional framework.
David Martin is a Scottish politician who has served as co-convener of the Citizens' Assembly of Scotland since 2019. A member of the Scottish Labour Party, he was a Member of the European Parliament (MEP) from 1984 to 2019, having first represented the Lothians constituency until 1999 and then for the Scotland constituency. He was the United Kingdom's longest serving MEP and the second longest serving MEP in the whole European Parliament.
The institutions of the European Union are the seven principal decision-making bodies of the European Union and the Euratom. They are, as listed in Article 13 of the Treaty on European Union:
The political structure of the European Union (EU) is similar to a confederation, where many policy areas are federalised into common institutions capable of making law; the competences to control foreign policy, defence policy or the majority of direct taxation policies are mostly reserved for the twenty-seven state governments. These areas are primarily under the control of the EU's member states although a certain amount of structured co-operation and coordination takes place in these areas. For the EU to take substantial actions in these areas, all Member States must give their consent. Union laws that override State laws are more numerous than in historical confederations; however the EU is legally restricted from making law outside its remit or where it is no more appropriate to do so at a state or local level (subsidiarity) when acting outside its exclusive competences. The principle of subsidiarity does not apply to areas of exclusive competence.
Klaus-Heiner Lehne is a German lawyer and politician who has been serving as member of the European Court of Auditors (ECA) since 2014. From 2016 until 2022, he was its 11th President
The European Union adopts legislation through a variety of legislative procedures. The procedure used for a given legislative proposal depends on the policy area in question. Most legislation needs to be proposed by the European Commission and approved by the Council of the European Union and European Parliament to become law.
The Venice Commission, officially European Commission for Democracy through Law, is an advisory body of the Council of Europe, composed of independent experts in the field of constitutional law. It was created in 1990 after the fall of the Berlin Wall, at a time of urgent need for constitutional assistance in Central and Eastern Europe.
The committees of the European Parliament are designed to aid the European Commission in initiating legislation.
Tonino Picula is a Croatian politician currently serving his third term as a Member of the European Parliament for Croatia, having successfully run in 2013, 2014, and 2019 European elections. He got involved in politics in the early 1990s and had served four consecutive terms as a member of the Croatian Parliament, having been elected in 2000, 2003, 2007, and 2011 parliamentary elections as a member of the center-left Social Democratic Party (SDP). He served as Minister of Foreign Affairs from 2000 to 2003 under prime minister Ivica Račan, and as mayor of Velika Gorica from 2005 to 2009.
Jacqueline Kay Swinburne is a Welsh Conservative politician who was a Member of the European Parliament (MEP) for Wales between 2009 and 2019.
Martin Scheinin is an international law scholar who served as the first United Nations Special Rapporteur on human rights and counter-terrorism in 2005–2011. He was selected for this position after serving for eight years (1997–2004) as member of the United Nations Human Rights Committee, the independent expert body monitoring states' compliance with the International Covenant on Civil and Political Rights. While on the committee, he was known as a defendant of the rights of minorities and indigenous peoples and opponent of capital punishment, as well as the drafter of the committee's General Comment No. 29 on states of emergency.
Indrek Tarand is an Estonian politician and Member of the European Parliament (MEP) from Estonia. He is an Independent politician, but a member of the European Green Party.
Lobbying in the European Union, also referred to officially as European interest representation, is the activity of representatives of diverse interest groups or lobbies who attempt to influence the executive and legislative authorities of the European Union through public relations or public affairs work. The Treaty of Lisbon introduced a new dimension of lobbying at the European level that is different from most national lobbying. At the national level, lobbying is more a matter of personal and informal relations between the officials of national authorities, but lobbying at the European Union level is increasingly a part of the political decision-making process and thus part of the legislative process. 'European interest representation' is part of a new participatory democracy within the European Union. The first step towards specialised regulation of lobbying in the European Union was a Written Question tabled by Alman Metten, in 1989. In 1991, Marc Galle, Chairman of the Committee on the Rules of Procedure, the Verification of Credentials and Immunities, was appointed to submit proposals for a Code of conduct and a register of lobbyists. Today lobbying in the European Union is an integral and important part of decision-making in the EU. From year to year lobbying regulation in the EU is constantly improving and the number of lobbyists is increasing.
Peter Simon was Member of the European Parliament (MEP) representing Germany from 2009 until 2019.
Tilly Metz, born on May 26, 1967 in Luxembourg City, is a Luxemburgish politician and member of the Green Party. After teaching humanities and social sciences, she was deputy director of the Lycée Technique pour Professions Educatives et Sociales (LTPES) in Mersch. She was mayor of the municipality of Weiler-la-Tour (Luxembourg) and has been a Member of the European Parliament since June 2018, as part of the Greens/EFA political group. She is particularly known for her stance on animal welfare, health-related issues and human rights.
Marco Dreosto is an Italian politician. He has been a Member of the European Parliament since 2 July 2019 elected with the Salvini Premier Lega party in the north-eastern constituency following the 2019 European elections where he got 23,179 votes
Christophe Hansen is a Luxembourgish politician belonging to the Christian Social People's Party (CSV), of which he is Secretary-General.
The Conference on the Future of Europe was a proposal of the European Commission and the European Parliament, announced at the end of 2019, with the aim of looking at the medium to long term future of the EU and what reforms should be made to its policies and institutions. It is intended that the Conference should involve citizens, including a significant role for young people, civil society, and European institutions as equal partners and last for two years. It will be jointly organised by the European Parliament, the EU Council and the European Commission. On 19 April 2021, the multilingual digital platform of the Conference futureu.europa.eu was launched.
(References:) Oxford Online Dictionary