In the UK, a general election must be held at least every five years. The Prime Minister can request the monarch to dissolve Parliament earlier and call an election. On polling day (normally a Thursday), voters in each of the 650 constituencies elect one MP under the first-past-the-post system. The party that wins a majority of seats forms the next government.
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If no party wins an overall majority, the result is a "hung parliament" and parties may negotiate a coalition or a minority government with a confidence-and-supply arrangement. After 2010 the Conservatives and Liberal Democrats formed a coalition; after 2017 the Conservatives ran a minority government with DUP support.
You may be asked the maximum gap between general elections (five years), what first-past-the-post means, or what a hung parliament is.
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