Why does the NFL have a 2-minute warning?

(NEXSTAR) — If you’ve seen plenty of commercials, or are just waiting for Kendrick Lamar's halftime show, the multiple interruptions to the Super Bowl may be slightly annoying. None, however, may be more confusing than the twice-a-game two-minute warning.

All NFL games have two-minute warnings, the automatic timeouts that occur when the game clock hits the two-minute mark at the end of the second and fourth quarters. After the two-minute warning, certain clock running rules also take effect.

Why does the NFL stop games and use different rules when there are just a couple of minutes left in the half?

As you may have guessed, the two-minute warning does offer another opportunity for commercials, which have monetary value, especially during the Super Bowl (spots were selling for a record $8 million this year, reports say). It also has value to teams, who view it as a bonus timeout, former NFL quarterback Rich Gannon told the Los Angeles Times in 2016.

Despite its modern benefits — more ad time and an extra break — the two-minute rule once served a more necessary purpose.

When pro football games began in the late 1890s, there was no clock for teams and coaches to check, Pro Football Hall of Fame archivist Jon Kendle explained to the LA Times. Instead, officials were advised to notify team captains when time was running out in the half, usually when there were five to ten minutes left (the game had two 45-minute halves at the time).

As years went by, the game got shorter. By 1942, the rules changed and the warning was given at the two-minute mark, Kendle said. Seven years later, the rules changed again, calling for a timeout when the two-minute warning is given.

The two-minute warning became less of a warning in the 1960s after the NFL decided to use the stadium clock as the official game clock (that’s why you’ll sometimes see the official ask for the clock to be reset).

As we mentioned before, there are different rules for certain plays after the two-minute warning.

For example, if there is an injury timeout after the two-minute warning, the team of the injured player will be charged a timeout, if they haven’t already used the three they get per half, according to the NFL rulebook. Teams are also not allowed to commit fouls — like intentional grounding or throwing an illegal pass — in order to conserve time.

So while your team strategizes on how to use the last two minutes of the half or game, you can take those two minutes to refill your snack plate or check in on your prop bets.