Membership in the National Football League (NFL) is certified by a franchise.
Franchises award member clubs the exclusive right to hold professional football games between league members within a 75-mile radius of their city as well as the exclusive rights to market games in their area.
[2] In the case of egregious misbehavior, a club's franchise can be revoked or suspended by the league's commissioner.
[3] The NFL has had a total of 49 franchises become defunct over its history;[4] this includes ten of the league's twelve founding members, with only the Chicago Bears and Arizona Cardinals surviving to the present day.
The most recent franchise to become defunct was the Dallas Texans, which folded in 1952 after one season in the league.