A more thorough explanation:

Definition: Nobility refers to people who hold a high social or political status, usually inherited or granted by the sovereign. In English law, nobility is divided into different degrees or peerages, such as dukes, earls, viscounts, and barons, and their female counterparts. Nobility is created either by a writ of summons to sit in Parliament or by a royal grant through letters patent, and was once usually accompanied by a large land grant. Nobility by writ descended to a person's bodily heirs. The modern practice is to grant nobility by letters patent, which provide limitations as to future heirs. The U.S. Constitution prohibits granting a title of nobility.

Examples: The Duke of Cambridge, Prince Harry, and the Earl of Wessex are all members of the British nobility. In medieval times, knights and lords were also considered part of the nobility.

Explanation: The examples illustrate how nobility is a social class that is inherited or granted by the sovereign. The Duke of Cambridge, Prince Harry, and the Earl of Wessex are all members of the British nobility because they were born into noble families. In medieval times, knights and lords were also considered part of the nobility because they held high social status and were often granted land and titles by the king or queen.