A prime minister is the head of government in a country, responsible for overseeing the administration and implementing laws. They are usually the leader of the political party that has the most seats in the parliament. The prime minister works with other government officials to create policies and manage public services. In many countries, the prime minister is appointed by the president or elected by the legislature. Their duties include representing the country in international matters, making decisions on national issues, and leading the executive branch of government. The role varies depending on the country's political system and constitution.