A works team, sometimes also referred to as factory team and company team, is a sports team that is financed and run by a manufacturer or other business, institution, or organization in a broad sense. Works teams have very close ties with their main sponsor and owner, and usually incorporate its logo, its name, or both, in the sport club or team logo. Sometimes, works teams contain or are entirely made up of employees of the supporting company. In motorsport, a works team or factory team is a manufacturer that builds its own car or motorbike including the engine.

In the United States and Canada, the term professional football includes the professional forms of American and Canadian gridiron football. In common usage, it refers to former and existing major football leagues in either country. Currently, there are multiple professional football leagues in North America: the two longest-running leagues are the National Football League (NFL) in the U.S, and the Canadian Football League (CFL) in Canada. American football leagues have existed in Europe since the late 1970s, with competitive leagues all over Europe hiring American Imports to strengthen rosters. The Austrian Football League and German Football League top division are known as the best leagues in Europe. The Japan X-League is also a strong league that has a long history since 1971. The NFL has existed continuously since being so named in 1922.