“Jack of all trades” is a common expression for a person who can do many different kinds of work or has skills in many areas.
The key word is jack. In older English, jack could mean an ordinary man, worker, or common fellow. Because of that, the phrase came to describe someone who could turn a hand to many tasks, not just one specialized job.
Today, the expression is often used in a positive way. It suggests flexibility, practicality, and usefulness, especially in places where one person needs to handle many responsibilities.
- She is a jack of all trades who can design, write, and manage projects.
- In a small business, a jack of all trades is often essential.
You may also hear the longer version, “jack of all trades, master of none.” That version adds a criticism, suggesting breadth without deep expertise. But the shorter phrase by itself is often complimentary in modern English.