If an NCAA football game is tied at the end of 60 minutes, it goes to overtime. A coin toss decides first possession and each team gets at least one offensive possession starting at their own 25-yard line.
The object is to score and prevent your opponent from doing the same. If the teams remain tied, they each get another offensive possession. Once they reach a fifth overtime period, teams run alternating 2-point conversions instead of starting at the 25-yard line.