American football, also known as American football, or coffee ball, is a popular team sport in the United States. American rugby is closely related to Canadian rugby but there are some differences in game rules and many other features. In the United States, some of the main forms of rugby are high school rugby, college football and professional rugby, which are basically the same but different at some point in the game rules.
The National Football League, or NFL for short, is the American rugby league for men. There are 32 teams participating. The tournament started in 1920 and went through two mergers with AAFC (American Stars Football League) and AFC (American Football League). The tournament takes place from the first Thursday of September and ends the first Sunday of February next year. The tournament has 3 stages: the beginning of the season takes place about 2 weeks at the end of August, the official season takes place in 3 months to near the new year and the playoff round takes place in 1 month of the fifth year.