Bowl games that are not part of the post-season are traditional games against rival schools such as Iron Bowl and Egg Bowl. Recently, the term "bowl" has been added to other games that have some special note or sub-plot to the actual game, in college or the National Football League. Examples of this are the Bowden Bowl, "Manning Bowl" and Ice Bowl. However, any game that is part of the post season is considered a bowl game, even if it is not a formal bowl game, such as all-star games. The Super Bowl, the NFL's championship game, started as a "world championship" between the champions of the rival American Football League and NFL in the same way many college bowl games bring together the champions of different college conferences.