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American Football
NFL
The National Football League (NFL) is the premier professional American football league in the world, consisting of 32 teams divided equally between the American Football Conference (AFC) and the National Football Conference (NFC). Founded in 1920 as the American Professional Football Association...
American Football (NCAA)
NCAA
The National Collegiate Athletic Association (NCAA) governs college football in the United States across three divisions: Division I (subdivided into FBS and FCS), Division II, and Division III. The NCAA was founded in 1906, largely in response to the dangerous nature of early football — Presiden...
Flag Football
IFAF
The International Federation of American Football (IFAF) governs international flag football, including the IFAF Flag Football World Championship (every 2 years) and qualification pathway for the 2028 Los Angeles Olympic Games, where flag football debuts as an Olympic medal sport. The IFAF 5-on-5...
Flag Football
NFHS
Flag Football under NFHS is the non-contact, flag-based variant of American football sanctioned by the National Federation of State High School Associations for use in U.S. high school athletic programs. It is one of the fastest-growing high school sports in the U.S. — over 20 state associations ...
Matching Rule Topics(10)
Three Downs — The Defining Rule
CFL
Canadian football uses 3 downs to advance 10 yards, compared to 4 downs in American football.
Section 5: Rules of Play
CFL
Canadian football uses 3 downs to advance 10 yards, compared to 4 downs in American football.
Section 4: Players & Officials
CFL
This is one of the most fundamental differences from American football: On the field: 12 players per side — one more than NFL/NCAA's 11; Extra player: Typically an additional defensive back or slotback/receiver. The wider field demands more coverage.; Roster: 46-player active roster, plus a pract...