President And Prime Minister?

Both presidents and prime ministers are heads of the executive branch of the government of a country. Prime ministers are found in governments with a parliament. The main difference is that a prime minister is the leader of the party with the most representatives in parliament, and a president is elected indirectly or directly by the voting public of that country. For example, if the Labour Party has the most elected members in the U.K.'s parliament, then the prime minister is the leader of the Labour Party. Since it's known in advance who the party leader is, voting for a local candidate by party in a parliamentary election is tantamount to voting for the party leader as head of the government. Some parliamentary democracies have a prime minister and a president. In that case, the president's position is primarily ceremonial.