The term "beau" has several meanings, depending on its context.
1) In French, "beau" is an adjective that means "handsome," "attractive," or "pretty." It can also be used as a noun to refer to a man who is considered handsome or charming.
2) In American English, particularly in the Southern United States, "beau" refers to a young man who is escorting a woman at an event such as a dance or social gathering. This usage of the term dates back to the 18th and 19th centuries when it was common for women to have male companions.
3) In British English, "beau" can also refer to a man who is considered very fashionable or well-dressed.