Portal:American football

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American football, known as football in the United States, is a team sport played between two teams of 11 players with an oval ball on a rectangular field 120 yards long and 53.3 yards wide with goalposts at either end. The team in possession of the ball (the offense) attempts to advance down the field by running with or passing the ball. In order to continue their drive, the offense must advance the ball at least 10 yards down the field in a series of four downs. If they succeed, they receive a new set of four downs to continue their drive, but if they fail, they lose control of the ball to the opposing team. The offense can score points by advancing the ball into the end zone (a touchdown) or by place or drop kicking the ball through the opponent's goalpost (a field goal), while the defense can score points by forcing an offensive turnover and advancing the ball into the offense's end zone or by tackling the ballcarrier in the offense's end zone (a safety). The team that has scored the most points by the end of the game wins.

American football evolved from early forms of rugby (particularly rugby union) and association football (soccer), with the first game played on November 6, 1869. Rule changes from 1880 on by Walter Camp included the snap, 11-a-side teams and downs; further rule changes legalized the forward pass and created the neutral zone along the width of the football. Today, American football is the most popular sport in the United States, where the National Football League (NFL) is the most popular league. The league's championship, the Super Bowl, is among the most-watched club sporting events in the world.

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The National Football League (NFL) playoffs are a single-elimination tournament held after the end of the regular season to determine the NFL champion. Six teams from each of the league's two conferences qualify for the playoffs based on regular season records, and a tie-breaking procedure exists in the case of equal records. The tournament ends with the Super Bowl, the league's championship game, which matches the two conference champions. NFL post-season history can be traced to the first NFL Championship Game in 1933, though in the early years, qualification for the game was based solely on regular season records. The first true NFL playoff began in 1967, when four teams qualified for the tournament. When the league merged with the American Football League in 1970, the playoffs expanded to eight teams. The playoffs were expanded to ten teams in 1978 and twelve teams in 1990. The NFL is the only one out of the four major professional sports leagues in the United States to use a single-elimination tournament in all four rounds of its playoffs; Major League Baseball (not including their Wild Card Showdown postseason round), the National Basketball Association and the National Hockey League all use a "best-of" format instead.
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Rex Ryan
Rex Ryan (born 1962) is an American football head coach for the New York Jets of the National Football League (NFL). After serving as an assistant coach for 22 years, Ryan attained his first head coaching job in the NFL with the Jets in 2009. He is the son of former Philadelphia Eagles and Arizona Cardinals head coach Buddy Ryan and is the fraternal twin brother of Rob Ryan, defensive coordinator for the Dallas Cowboys. Upon graduating from Southwestern Oklahoma State University, Ryan spent the next 22 years serving as an assistant coach on different teams at both the college and professional level. At the behest of their head coach Brian Billick, Ryan joined the Baltimore Ravens in 1999 and spent nine years there. In 2005 he earned the title of defensive coordinator and in 2008 became the assistant head coach. Hours after the Ravens lost to the Steelers in the 2008 playoffs, Ryan accepted a contract offer from the Jets for their vacant head coaching position. He has become well known throughout the league for his outspoken manner, boisterous attitude and success with the Jets, and his teams are highly regarded by critics for their defensive capabilities.
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