American Football Rules
Game play in American football consists of a series of downs, individual plays of short duration, outside of which the ball is dead or not in play. These can be plays from scrimmage—passes, runs, punts, or field goal attempts—or free kicks such as kickoffs. Substitutions can be made between downs, which allows for a great deal of specialization as coaches choose the players best suited for each particular situation. During a play, each team should have no more than 11 players on the field, and each of them has specific tasks assigned for that specific play.
Read more about American Football Rules: Objective of The Game, Time of Play, Scrimmage Downs, Free Kick Downs, Officials, Fouls and Their Penalties, Timeouts, Instant Replay
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—Henry David Thoreau (1817–1862)