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What is a state visit?
A state visit is a formal visit to the UK by an important foreign leader - including monarchs, presidents or prime ministers.
It is normally at the invitation of the Queen, who acts on advice from the government and who is the UK's head of state.
They are grand occasions, which aim to strengthen relationships between countries.
The Queen acts as the official host during the trip and she usually welcomes one or two heads of state a year.
Her Majesty has hosted over 100 state visits since becoming monarch in 1952.
Guests usually stay at Buckingham Palace or Windsor Castle, and there is usually a special state banquet in honour of the visitor.
A visit to - and speeches at - the Houses of Parliament can also form part of the schedule.
US President Donald Trump has now landed in the UK for a three-day state visit.
Mr Trump previously met the Queen at Windsor Castle when he came to the UK in July 2018 on a working visit.