Britain is a parliamentary democracy with a constitutional monarch. Queen Elizabeth II is the head of state, but she has no real power and her role is mostly ceremonial. She acts on the advice of her ministers.
In Britain it is Parliament that has power which makes laws. It is made up of the House of Lords and the House of Commons. The members of the House of Lords are permanent — mostly lords and people who have been made lords for life. The Lords can revise and even delay bills. The members of the Commons are elected by the people. They control the executive branch and discuss most important political problems.
The largest party in the Commons forms the government and its leader becomes Prime Minister. Officially Parliament appoints Prime Minister. The Prime Minister chooses the Cabinet and non-cabinet ministers. They are all collectively responsible for the government, the executive branch, and individually respon sible for their departments.