Two. The Super Bowl is pro football's world championship game. Sort of like the World Series in Baseball. However, it is a single-elimination championship. One game, rather than a best-of-seven series decides the outcome. One team from the AFC and one from the NFC play in the Super Bowl. The two teams won their respective conference championship games.
The NFL currently has 32 teams. A season sees 6 teams make it to the playoffs to compete to be the champions of the Super Bowl.
Eight NFL wildcard teams have made it to the Super Bowl.
17 teams won the super bowl that was the 1st seed
There were 15 teams in the NFL, and 9 teams in the AFL.