Running out the clock
In American football, each quarter of a game is measured with a 15-minute game clock, or 12-minute clock in many high school football codes and the German Football League. A team in possession of the lead and the ball will attempt to use up as much of the game clock as possible in order to bring the game to an end more quickly, thus denying the opposition another chance on offense.
Quarterback kneel
In Canadian football, which use slightly different rules, kneeling with time left is not necessarily a viable strategy. Unlike in American football, in Canadian football every quarter must end with a play even in situations where the game clock expires after the end of the previous play. However, a quarterback kneel is by far the most common play for winning teams to run with ""zeros on the clock"" at the end of a game, barring exceptional (but not unheard-of) situations where the head-to-head point differential in the opposing teams' season series (a key factor in tiebreakers) remains in doubt.