Data retention defines the policies of persistent data and records management for meeting legal and business data archival requirements. Although sometimes interchangeable, it is not to be confused with the Data Protection Act 1998.

The different data retention policies weigh legal and privacy concerns against economics and need-to-know concerns to determine the retention time, archival rules, data formats, and the permissible means of storage, access, and encryption.In the field of telecommunications, data retention generally refers to the storage of call detail records (CDRs) of telephony and internet traffic and transaction data (IPDRs) by governments and commercial organisations. In the case of government data retention, the data that is stored is usually of telephone calls made and received, emails sent and received, and websites visited. Location data is also collected.

The primary objective in government data retention is traffic analysis and mass surveillance. By analysing the retained data, governments can identify the locations of individuals, an individual's associates and the members of a group such as political opponents. These activities may or may not be lawful, depending on the constitutions and laws of each country. In many jurisdictions access to these databases may be made by a government with little or no judicial oversight.In the case of commercial data retention, the data retained will usually be on transactions and web sites visited.

Data retention also covers data collected by other means (e.g., by Automatic number-plate recognition systems) and held by government and commercial organisations.

The Bundestag (German pronunciation: [ˈbʊndəstaːk] (listen), "Federal Diet") is the German federal parliament. It is the only federal representative body that is directly elected by the German people. It is comparable to the United States House of Representatives or the House of Commons of the United Kingdom. The Bundestag was established by Title III of the Basic Law for the Federal Republic of Germany (German: Grundgesetz, pronounced [ˈɡʁʊntɡəˌzɛt͡s] (listen)) in 1949 as one of the legislative bodies of Germany and thus it is the historical successor to the earlier Reichstag.

The members of the Bundestag are representatives of the German people as a whole, are not bound by any orders or instructions and are only accountable to their electorate. The minimum legal number of members of the Bundestag (German: Mitglieder des Bundestages) is 598; however, due to the system of overhang and leveling seats the current 20th Bundestag has a total of 736 members, making it the largest Bundestag to date.

The Bundestag is elected every four years by German citizens aged 18 or over. Elections use a mixed-member proportional representation system which combines first-past-the-post elected seats with a proportional party list to ensure its composition mirrors the national popular vote. An early election is only possible in the cases outlined in Articles 63 and 68 of the Grundgesetz.

The Bundestag has several functions. It is the chief legislative body on the federal level. The individual states (Bundesländer) of Germany participate in legislative process through the Bundesrat, a separate assembly. The Bundestag also elects and oversees the chancellor, Germany's head of government, and sets the government budget.

Since 1999, it has met in the Reichstag building in Berlin. The Bundestag also operates in multiple new government buildings in Berlin and has its own police force (the Bundestagspolizei). The current president of the Bundestag since 2021 is Bärbel Bas of the SPD. The 20th Bundestag has five vice presidents.