A British prince is a special title given to a man who is born into the royal family of the United Kingdom. He is a member of the royal family and is related to the Queen, who is the head of the royal family.
A prince usually has a lot of nice things, like fancy clothes and big houses. People might treat him very nicely because he is part of the royal family.
There are different types of British princes. For example, the oldest son of the Queen is called the Prince of Wales. Other sons of the Queen are called princes as well.
When a prince gets married, his wife becomes a princess. The children of a prince and princess are also called princes and princesses.
Sometimes, a prince can become the King of the United Kingdom if the current king (or queen) dies. So being a British prince can be a very important and special thing!