What is the name of a government where the government is divided between two branches?

A government divided between two branches is known as a bicameral legislature. This structure typically features an upper house and a lower house, each with distinct powers and responsibilities. Common examples include the United States Congress, which consists of the Senate and the House of Representatives, and the Parliament in the United Kingdom, which comprises the House of Lords and the House of Commons. This division aims to ensure a system of checks and balances within the government.