An all-seater stadium is a stadium meant for activity or games.
American football , referred to as football in the United States and Canada , and also known as `` gridiron football '' or simply `` gridiron '' , is a sport played by two teams of eleven players on a rectangular field with goalposts at each end .. gridiron. gridiron football. gridiron football. gridiron football. sport. team sport. football. Football ( ball )#American and Canadian football. The offense , the team with control of the oval-shaped football , attempts to advance down the field by running with or passing the ball , while the team without control of the ball , the defense , aims to stop their advance and take control of the ball for themselves .. offense. offense ( sports ). football. Football ( ball )#American and Canadian football. running. Rush ( gridiron football ). passing. Forward pass#American and Canadian football. The offense must advance at least ten yards in four downs , or plays , or else they turn over the football to the opposing team ; if they succeed , they are given a new set of four downs .. offense. offense ( sports ). football. Football ( ball )#American and Canadian football. downs. Down ( gridiron football ). turn over. turnover on downs. Points are primarily scored by advancing the ball into the opposing team 's end zone for a touchdown or kicking the ball through the opponent 's goalposts for a field goal .. touchdown. touchdown. field goal. Field goal ( American and Canadian football ). The team with the most points at the end of a game wins .. American football evolved in the United States , originating from the sports of association football and rugby football .. football. Football ( ball )#American and Canadian football. association football. association football. rugby football. rugby football. The first game of American football was played on November 6 , 1869 , between two college teams , Rutgers and Princeton , under rules based on the association football rules of the time .. Princeton. Princeton Tigers football. Rutgers. Rutgers Scarlet Knights football. football. Football ( ball )#American and Canadian football. association football. association football. During the latter half of the 1870s , colleges playing association football switched to the Rugby Union code , which allowed carrying the ball .. football. Football ( ball )#American and Canadian football. association football. association football. Rugby Union code. rugby union. A set of rule changes drawn up from 1880 onward by Walter Camp , the `` Father of American Football '' , established the snap , eleven-player teams , and the concept of downs ; later rule changes legalized the forward pass , created the neutral zone , and specified the size and shape of the football .. Football. Football ( ball )#American and Canadian football. football. Football ( ball )#American and Canadian football. downs. Down ( gridiron football ). 1880 college football season. Walter Camp. Walter Camp. snap. snap ( gridiron football ). forward pass. forward pass. neutral zone. neutral zone ( gridiron football ). American football as a whole is the most popular sport in the United States .. sport. team sport. football. Football ( ball )#American and Canadian football. sport in the United States. sport in the United States. Professional football and college football are the most popular forms of the game , with the other major levels being high school and youth football .. football. Football ( ball )#American and Canadian football. college football. college football. high school. high school football. , nearly 1.1 million high school athletes and 70,000 college athletes play the sport in the United States annually , almost all of them men , with a few exceptions .. sport. team sport. sport in the United States. sport in the United States. high school. high school football. with a few exceptions. women's American football. The National Football League , the most popular American football league , has the highest average attendance of any professional sports league in the world ; its championship game , the Super Bowl , ranks among the most-watched club sporting events in the world , and the league has an annual revenue of around US$ 10 billion .. Football. Football ( ball )#American and Canadian football. football. Football ( ball )#American and Canadian football. National Football League. National Football League. highest average attendance of any professional sports league in the world. List of sports attendance figures#Top leagues in total attendance. Super Bowl. Super Bowl