Gridiron football (), also known as North American football, or in North America as simply football, is a family of football team sports primarily played in the United States and Canada. American football, which uses 11 players, is the form played in the United States and the best known form of gridiron football worldwide, while Canadian football, which uses 12 players, predominates in Canada. Other derivative varieties include arena football, flag football and amateur games such as touch and street football. Football is played at professional, collegiate, high school, semi-professional, and amateur levels.
These sports originated in the 19th century out of older games related to modern rugby football, more specifically rugby union football. Early on, American and Canadian football developed alongside (but independently from) each other; the root of the game known as "football" today originates with an 1874 game between Harvard and McGill Universities, following which the American school adopted the Canadian school's more rugby-like rules.
Over time, Canadian teams adopted features of the American variant of the game and vice versa. Both varieties are distinguished from other football sports by their use of hard plastic helmets and shoulder pads, the forward pass, the system of downs, a number of unique rules and positions, measurement in customary units of yards (even in Canada, which largely metricated in the 1970s), and a distinctive brown leather ball in the shape of a prolate spheroid with pointed ends.
The international governing body for the sport is the International Federation of American Football (IFAF); although the organization plays all of its international competitions under American rules, it uses a definition of the game that is broad enough that it includes Canadian football under its umbrella, and Football Canada (the governing body for Canadian football) is an IFAF member.
Etymology
The sport is typically known as simply "football" in the countries where it originated, regardless of the specific variety. Various sources use the term "North American football" when discussing the American and Canadian games together, but this term is quite rare.
The two sports are also sometimes known as "gridiron football." The name originated with the sport's once-characteristic playing field: the original American football and Canadian football fields were marked by a series of parallel lines along both the width and length of the field, which produced a checkerboard pattern resembling a cross-hatched cooking gridiron. The ball would be snapped in the grid in which it was downed on the previous play. By 1920, the grid system was abandoned in favor of the system of yard lines and hash marks used today. This is still called a gridiron, so the pattern changed, but the name did not.
The International Federation of American Football (IFAF), uses "American football" inclusive of Canadian football and other varieties.
History
The sport developed from informal games played in North America during the 19th century. Early games had a variety of local rules and were generally similar to modern rugby union and soccer. The earliest recorded instance of gridiron football occurred at University of Toronto's University College in November 1861.
Later in the 1860s, teams from universities were playing each other, leading to more standardized rules and the creation of college football. While several American schools adopted rules based on the soccer rules of the English Football Association, Harvard University held to its traditional "carrying game". Meanwhile, McGill University in Montreal used rules based on rugby union. In 1874, Harvard and McGill organized two games using each other's rules. Harvard took a liking to McGill's rugby-style rules and adopted them. In turn, they were used when Harvard and Yale University played their first intercollegiate sports game in 1875, and after which the rugby-style Canadian game was adopted by Yale players and spectators from Yale and Princeton University. This version of the game was subsequently played with several other U.S. colleges over the next several years.