The parliamentary system of government is the most common type of democratic government. In a parliamentary system, citizens elect members of parliament called MPs. The MPs choose a leader from among themselves called the prime minister. The prime minister is the chief executive of the country. The chief executive heads the military, enforces laws, and keeps the country running day to day. The prime minister leads the lawmaking body – parliament. MPs are elected to serve for a certain amount of time, but the parliament can be dissolved and elections held again if the prime minister feels the government is not working well. If MPs believe that the prime minister is not making good decisions, they can vote to have new elections. The country may have a king or queen with little ruling power of a president who serves as the head of state. In a parliamentary system, the head of state is the symbolic leader of the country. Australia, Canada and the United Kingdom are examples of countries with a parliamentary system. The king or queen of the United Kingdom is the head of state for each of these countries.