A coalition government is a cabinet of a parliamentary government in which several political parties cooperate. The usual reason given for this arrangement is that no party on its own can achieve a majority in the parliament. A coalition government might also be created in a time of national difficulty or crisis, for example during wartime, or economic crisis, to give a government the high degree of perceived political legitimacy, or collective identity it desires whilst also playing a role in diminishing internal political strife. In such times, parties have formed all-party coalitions (national unity governments, grand coalitions). If a coalition collapses, a confidence vote is held or a motion of no confidence is taken.

To deal with a situation in which no clear majorities appear through general elections, parties either form coalition cabinets, supported by a parliamentary majority, or minority cabinets which may consist of one or more parties. Cabinets based on a coalition with majority in a parliament, ideally, are more stable and long-lived than minority cabinets. While the former are prone to internal struggles, they have less reason to fear votes of non-confidence. Majority governments based on a single party are typically even more stable, as long as their majority can be maintained.

Nicholas William Peter "Nick" Clegg (born 7 January 1967) is the British Liberal Democrat Leader since 2007 and currently the Deputy Prime Minister and Lord President of the Council (with special responsibility for political and constitutional reform) in the coalition government of which David Cameron is the Prime Minister. Clegg has been the Leader of the Liberal Democrats since 2007, and a Member of Parliament (MP) representing Sheffield Hallam since 2005. He was previously a Member of the European Parliament (MEP) and an award winning journalist for the Financial Times.

Clegg was elected to the House of Commons at the 2005 general election and became the Liberal Democrats' Home Affairs spokesperson in 2006. Clegg became Deputy Prime Minister following the 2010 general election, when the Liberal Democrats formed a coalition government with the Conservative Party. As well as his parliamentary roles, Clegg has contributed to many pamphlets and books on political issues. He has also had a large number of jobs, including being a skiing instructor and working in the office of a bank in Helsinki.