A more thorough explanation:

Definition: A group of people who are born into a high social class and have special privileges. It can also refer to a government that is ruled by this privileged class.

Examples:

• The British royal family is an example of an aristocracy. They were born into a high social class and have special privileges, such as living in palaces and having access to private jets.
• In ancient Greece, some city-states were ruled by an aristocracy. Only people who were born into certain families could hold positions of power.

These examples show how aristocracy is a system where certain people have more power and privileges than others simply because of their birth. It is a form of social hierarchy that has existed throughout history.