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In a country whose system of government is a monarchy, the ruler, or head of state, is decided by inheritance. That is, when a ruler dies their child, or nearest relative, takes over. For much of history most countries were governed in this way, especially in Europe. Some countries elect their monarch instead of using inheritance, like the Holy Roman Empire and Malaysia.
The wife of a king is also called a queen. However the husband of a female ruler is not necessarily called a king. The last King of Britain (George VI) had a wife (Elizabeth) who was called Queen Elizabeth. He had no sons, so he was followed by his elder daughter. She is also called Elizabeth and became Queen Elizabeth II. She is married to The Duke of Edinburgh; but when she became Queen he did not become King.
Many people do not think it is good to have a Queen, because she is not elected, though most people in the UK want to keep the royal family.
A queen regnant is head of state, and has all the powers of a sovereign.
A queen regnant does not keep the title of queen if she abdicates (resigns). No queen has ever abdicated in the history of the United Kingdom, but two abdications have occurred in the Kingdom of the Netherlands:
A queen dowager is the widow of a king.
A queen consort usually keeps the title of Queen after her husband's death, for example