The idiomatic expression "Jack of all trades" refers to a person who is competent in multiple skills or areas, rather than being highly skilled in just one. This term originated from the character of Jack, an archetypal figure from 16th century England known for his versatility and ability to perform various tasks. The phrase has come to be used as a complimentary term when describing someone who is adaptable, resourceful, and capable in many different fields or situations.