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 prior to 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.
The Super Bowl is among the world's most-watched sporting events and frequently the most-watched American television broadcast of the year. It is second only to the UEFA Champions League final as the most-watched annual sporting event worldwide and the seven most-watched broadcasts in American television history are Super Bowls. Super Bowl XLIX in 2015 is the most-watched American television program with an audience of 114.4 million viewers, the fifth time in six years that the game set a viewership record.
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 day for American food consumption, after Thanksgiving Day.
According to en.wikipedia