The Super Bowl is the annual playoff championship game of the National Football League (NFL). It has served as the final game of every NFL season since 1966, replacing the NFL Championship Game. Beginning in 2022, the game will be played on the second Sunday in February. Prior Super Bowls were played on Sundays in early to mid-January from 1967 to 1978, late January from 1979 to 2003, and the first Sunday of February from 2004 to 2021. Winning teams are awarded the Vince Lombardi Trophy, named after the eponymous coach who won the first two Super Bowls. Due to the NFL restricting use of its "Super Bowl" trademark, it is frequently referred to as the "big game" or other generic terms by non-sponsoring corporations. The day the game is played is often referred to as Super Bowl Sunday or Super Sunday.

The game was created as part of a 1966 merger agreement between the NFL and the rival American Football League (AFL) to have their best teams compete for a championship. It was originally called the AFL–NFL World Championship Game until the "Super Bowl" moniker was adopted in 1969's Super Bowl III. The first four Super Bowls from 1967 to 1970 were played before the merger, with the NFL and AFL each winning two. After the merger in 1970, the 10 AFL teams and three NFL teams formed the American Football Conference (AFC), while the remaining 13 NFL teams formed the National Football Conference (NFC). All games since 1971's Super Bowl V have been played between the two best teams from each conference, with the NFC leading the AFC 26–25.

Of the NFL's current 32 teams, 20 (11 NFC, 9 AFC) have won a Super Bowl and 14 (8 AFC, 6 NFC) hold multiple titles. The AFC's New England Patriots and Pittsburgh Steelers have the most Super Bowl titles at six each; the Patriots also have the most appearances at 11. Among NFC franchises, the Dallas Cowboys and San Francisco 49ers have the most titles with five each and the Cowboys have the most appearances with eight. The Patriots and the Denver Broncos of the AFC hold the record for the most defeats in the Super Bowl, with five each. The Baltimore Ravens of the AFC and the Tampa Bay Buccaneers of the NFC are the only franchises to be undefeated in multiple Super Bowls, having won two each. Among the 12 teams who have not won a Super Bowl, the AFC's Cleveland Browns, Houston Texans, and Jacksonville Jaguars and the NFC's Detroit Lions are the only four to have not appeared in the game. The Super Bowl is among the world's most-watched single sporting events and frequently commands the largest audience among all American broadcasts during the year. It is second only to the UEFA Champions League final as the most watched annual club sporting event worldwide and the seven most-watched broadcasts in American television history are Super Bowls. Commercial airtime during the Super Bowl broadcast is the most expensive of the year because of the high viewership, leading to companies regularly developing their most expensive advertisements for this broadcast and commercial viewership becoming an integral part of the event. The Super Bowl is also the second-largest event for American food consumption, behind Thanksgiving dinner.

For four decades after its 1920 inception, the NFL successfully fended off several rival leagues. In 1960, the NFL encountered its most serious competitor when the American Football League (AFL) was formed. The AFL vied with the NFL for players and fans. The original "bowl game" was the Rose Bowl Game in Pasadena, California, which was first played in 1902 as the "Tournament East–West football game" as part of the Pasadena Tournament of Roses and moved to the new Rose Bowl Stadium in 1923. The stadium got its name from the fact that the game played there was part of the Tournament of Roses and that it was shaped like a bowl, much like the Yale Bowl in New Haven, Connecticut. The Tournament of Roses football game eventually came to be known as the Rose Bowl Game. Exploiting the Rose Bowl Game's popularity, post-season college football contests were created for Miami (the Orange Bowl), New Orleans (the Sugar Bowl), and El Paso (the Sun Bowl) in 1935, and for Dallas (the Cotton Bowl) in 1937. By the time the first Super Bowl was played, the term "bowl" for any major American football game was well established.

The Packers defeated the Chiefs in the first AFL–NFL Championship Game, Super Bowl I.

After the American Football League's inaugural season, AFL commissioner Joe Foss sent an invitation to the NFL on January 14, 1961, to schedule a "World Playoff" game between the two leagues' champions, beginning with the upcoming 1961 season. The first World Playoff game would have, if actually played, matched up the Houston Oilers vs. the Green Bay Packers. It took a half-dozen more seasons for this idea to become a reality.

In the mid-1960s, Lamar Hunt, owner of the AFL's Kansas City Chiefs, first used the term "Super Bowl" to refer to the AFL–NFL championship game in the merger meetings. Hunt later said the name was likely in his head because his children had been playing with a Super Ball toy; a vintage example of the ball is on display at the Pro Football Hall of Fame in Canton, Ohio. In a July 25, 1966, letter to NFL commissioner Pete Rozelle, Hunt wrote, "I have kiddingly called it the 'Super Bowl,' which obviously can be improved upon." The leagues' owners chose the name "AFL–NFL Championship Game", but in July 1966 the Kansas City Star quoted Hunt in discussing "the Super Bowl—that's my term for the championship game between the two leagues", and the media immediately began using the term. Although the league stated in 1967 that "not many people like it", asking for suggestions and considering alternatives such as "Merger Bowl" and "The Game", the Associated Press reported that "Super Bowl" "grew and grew and grew—until it reached the point that there was Super Week, Super Sunday, Super Teams, Super Players, ad infinitum". "Super Bowl" became official beginning with the third annual game. Roman numerals are used to identify each Super Bowl, rather than the year in which it is held, since the fifth edition, in January 1971. The sole exception to this naming convention tradition occurred with Super Bowl 50, which was played on February 7, 2016, following the 2015 regular season, and the following year, the nomenclature returned to Roman numerals for Super Bowl LI, following the 2016 regular season.

The Jets were the first AFL team to win a Super Bowl (Super Bowl III), defeating the Colts. After the NFL's Green Bay Packers won the first two Super Bowls, some team owners feared for the future of the merger. At the time, many doubted the competitiveness of AFL teams compared with their NFL counterparts, though that perception changed when the AFL's New York Jets defeated the NFL's Baltimore Colts in Super Bowl III in Miami. One year later, the AFL's Kansas City Chiefs defeated the NFL's Minnesota Vikings 23–7 in Super Bowl IV in New Orleans, which was the final AFL–NFL World Championship Game played before the merger. Beginning with the 1970 season, the NFL realigned into two conferences; the former AFL teams plus three NFL teams (the Baltimore Colts, Pittsburgh Steelers, and Cleveland Browns) would constitute the American Football Conference (AFC), while the remaining NFL clubs would form the National Football Conference (NFC). The champions of the two conferences would play each other in the Super Bowl. The winning team receives the Vince Lombardi Trophy, named after the coach of the Green Bay Packers, who won the first two Super Bowl games and three of the five preceding NFL championships in 1961, 1962, and 1965. Following Lombardi's death in September 1970, the trophy was named after him. The first trophy awarded under the new name was presented to the Baltimore Colts following their win in Super Bowl V in Miami. The coin toss was usually presented by a former football player or a special guest to recognize their community involvement or significance.