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Head of state
In a modern republic, the head of state is a president, usually elected by the people or by a parliament. In a monarchy, the head of state is the king or queen. Some countries have different systems - for example the head of state of the Vatican City is the Pope.
In a modern monarchy, the head of state usually has little real power. Instead, the most powerful person is the head of government. This is usually the leader of the political party that wins the most seats in an election. In these cases the king is considered to be the leader of the country, but must always take the decisions that the head of government advises them to make. The king or queen carries out national ceremonies. The United Kingdom works like this, with the Prime Minister heading the government.
A president may be the most powerful person in the country. This is true in the United States. However, sometimes there is a head of government, as well as a president. The president then acts very much like a king or queen, leaving the real decisions to the head of government. The Republic of Ireland works like this.
In older times, and in some modern countries, the head of state has absolute power, this called an absolute monarchy.