a college football overtime rules are
-teams will play extra periods until there is a winner.
-order of possession changes each period.
-an extra period begins at the 25-yard line.
-each team is given the opportunity to score a touchdown or field goal.
an NFL overtime rules are
-if the first possession results in a touchdown or safety, the scoring team wins.
-During the regular season in the NFL, one overtime period is played (with each team receiving two time outs).
-If both teams are tied after the 10-minute overtime, the game officially ends in a tie.