Answer: The House of Commons, domestically often referred to simply as the Commons, is the lower house and de facto primary chamber of the Parliament of the United Kingdom. Like the upper house, the House of Lords, it meets in the Palace of Westminster.
The Commons is an elected body consisting of 650 members known as members of Parliament (MPs). MPs are elected to represent constituencies by the first-past-the-post system and hold their seats until Parliament is dissolved.
The House of Commons of England started to evolve in the 13th and 14th centuries. It became the House of Commons of Great Britain after the political union with Scotland in 1707, and assumed the title of ’House of Commons of Great Britain and Ireland’ after the political union with Ireland at the start of the 19th century. The "United Kingdom" referred to was the United Kingdom of Great Britain and Ireland from 1800, and became the United Kingdom of Great Britain and Northern Ireland after the independence of the Irish Free State in 1922. Accordingly, the House of Commons assumed its current title.
Under the Parliament Acts 1911 and 1949, the Lords' power to reject legislation was reduced to a delaying power. The government is solely responsible to the House of Commons and the prime minister stays in office only as long as they retain the confidence of a majority of the Commons.
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