The side of the game that begins without the football, whose primary goal is to not allow the offense to score points.
There have been many dominant defensive teams in NFL history. The Minnesota Vikings of the 1970s, known as "The Purple People Eaters", were considered the most dominant, yet never won a Super Bowl. "The Steel Curtain" Pittsburgh Steelers were by far the most feared defense of all time. During their dominant run, they produced four Super Bowl victories in the 1970s and 1980. As the saying goes, "Defense wins championships."