Gridiron football in the context of "Dance squad"

A stadium (pl.: stadiums or stadia) is a place or venue for (mostly) outdoor sports, concerts, or other events and consists of a field or stage completely or partially surrounded by a tiered structure designed to allow spectators to stand or sit and view the event. Pausanias noted that for about half a century the only event at the ancient Greek Olympic festival was the race that comprised one length of the stadion at Olympia, where the word "stadium" originated. Most of the stadiums with a capacity of at least 10,000 are used for association football. Other popular stadium sports include gridiron football, baseball, cricket, the various codes of rugby, field lacrosse, bandy, and bullfighting. Many large sports venues are also used for concerts.

The 2028 Summer Olympics will introduce the sport of flag football for the first time. Two events, one for men and one for women, will be held. Flag football, a non-contact variant of American football in which players remove flags attached to the ball carrier instead of tackling them, was previously contested at the 2022 World Games and was featured at the 2025 World Games.

Football is a family of team sports that involve, to varying degrees, kicking a ball to score a goal. Unqualified, the word football generally means the form of football that is the most popular where the word is used. Sports commonly called football include association football (known as soccer in Australia, Canada, South Africa, the United States, and sometimes in Ireland and New Zealand); Australian rules football; Gaelic football; gridiron football (specifically American football, arena football, or Canadian football); International rules football; rugby league football; and rugby union football. These various forms of football share, to varying degrees, common origins and are known as "football codes".There are a number of references to traditional, ancient, or prehistoric ball games played in many different parts of the world. Contemporary codes of football can be traced back to the codification of these games at English public schools during the 19th century, itself an outgrowth of medieval football. The expansion and cultural power of the British Empire allowed these rules of football to spread to areas of British influence outside the directly controlled empire. By the end of the 19th century, distinct regional codes were already developing: Gaelic football, for example, deliberately incorporated the rules of local traditional football games in order to maintain their heritage. In 1888, the Football League was founded in England, becoming the first of many professional football associations. During the 20th century, several of the various kinds of football grew to become some of the most popular team sports in the world.

Flag football is a variant of gridiron football (American football or Canadian football depending on location) where, instead of tackling players to the ground, the defensive team must remove a flag or flag belt from the ball carrier ("deflagging") to end a down. In flag football, contact is limited between players. The sport has a strong amateur following with several national and international competitions each year sponsored by various associations but is most popularly played in America where it was invented. The international governing body for the sport is the International Federation of American Football (IFAF) with the International Woman's Flag Football Association (IWFFA) governing the women's game.

Flag football will be a discretionary event for the 2028 Summer Olympics in Los Angeles, the first time any gridiron football code has been a full part of an Olympic programme.

American football, referred to simply as football in the United States and Canada and also known as gridiron football, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end. The offense, the team with possession of the oval-shaped football, attempts to advance down the field by running with the ball or throwing it, while the defense, the team without possession of the ball, aims to stop the offense's advance and to take control of the ball for themselves. The offense must advance the ball at least ten yards in four downs or plays; if they fail, they turn over the football to the defense, but if they succeed, they are given a new set of four downs to continue the drive. Points are scored primarily 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. The team with the most points at the end of the game wins. In the case of a tie after four quarters, the game enters overtime.

American football evolved in the United States, originating from the sports of soccer and rugby. The first American football game was played on November 6, 1869, between two college teams, Rutgers and Princeton, using rules based on the rules of soccer at the time; by 1875, the sport had adopted rules similar to rugby union. A set of rule changes drawn up from 1880 onward by Walter Camp, the "Father of American Football", established concepts that would define the sport, among them the snap, the line of scrimmage, 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. The modern sport is closely related to Canadian football, which evolved in parallel with and at the same time as the American game; the two sports are considered the primary variants of gridiron football.

A contact sport is any sport where physical contact between competitors, or their environment, is an integral part of the game. Examples include gridiron football, martial arts, and acrobatic sports. Contact may come about as the result of intentional or incidental actions by the players in the course of play. This is in contrast to noncontact sports where players often have no opportunity to make contact with each other and the laws of the game may expressly forbid contact. In contact sports some forms of contact are encouraged as a critical aspect of the game such as tackling, while others are incidental such as when shielding the ball or contesting an aerial challenge. As the types of contact between players is not equal between all sports they define the types of contact that is deemed acceptable and fall within the laws of the game, while outlawing other types of physical contact that might be considered expressly dangerous or risky such as a high tackle or spear tackle, or against the spirit of the game such as striking below the belt or other unsportsmanlike conduct. Where there is a limit as to how much contact is acceptable most sports have a mechanism to call a foul by the referee, umpire or similar official when an offence is deemed to have occurred.

Contact sports are categorised by the American Academy of Pediatrics (AAP) into three main categories: contact, limited-contact and noncontact. In attempting to define relative risk for competitors in sports the AAP have further defined contact sports as containing some element of intentional collision between players. They define such collision sports as being where: "athletes purposely hit or collide with each other or with inanimate objects (including the ground) with great force", while in limited-contact sports such impacts are often "infrequent and inadvertent". While contact sports are considered the most high risk for injury, in some sports being a major feature (such as boxing or other martial arts), limited-contact and noncontact sports are not without risk as injury or contact may come about as a result of a fall or collision with the playing area, or a piece of sporting equipment, such as being struck by a hockey stick or football or even a piece of protective wear worn by a teammate or opposition player.

Arena football is a variety of gridiron football designed to be played indoors. The game is played on a smaller field than American or Canadian football, designed to fit in the same surface area as a standard North American ice hockey rink, and features between six and eight players for each team playing at any given time depending on the league, resulting in a faster and higher-scoring game that can be played on the floors of indoor arenas. The sport was invented in 1981, and patented in 1987, by Jim Foster, a former executive of the National Football League and the United States Football League. The name is trademarked by Gridiron Enterprises and had a proprietary format until its patent expired in 2007.

Three leagues have played under official arena football rules: the Arena Football League, which played 32 seasons in two separate runs from 1987 to 2008 and 2010 to 2019; arenafootball2, the AFL's erstwhile developmental league, which played 10 seasons from 2000 through 2009; and the China Arena Football League, which played two abbreviated seasons in 2016 and 2019 but was not directly affiliated with the now-defunct AFL. A 2024 reboot of the Arena Football League used the original league's rulebook with minor variations.

In the United States and Canada, the term professional football (French: football professionnel) includes the professional forms of American and Canadian gridiron football. In common usage, it refers to former and existing major football leagues in either country. Currently, there are multiple professional football leagues in North America: the two longest-running leagues are the National Football League (NFL) in the United States, and the Canadian Football League (CFL) in Canada. American football leagues have existed in Europe since the late 1970s, with competitive leagues all over Europe hiring American imports to strengthen rosters. The Austrian Football League and German Football League top division are known as the best leagues in Europe. The Japanese X-League is also a strong league that has a long history since 1971. The NFL has existed continuously since being so named in 1922.

The best American football players are among the highest paid athletes in the world, with the highest salaries reaching tens of millions of dollars per year.