What is one situation that causes play to be stopped?

Stopping play is a fundamental aspect of maintaining order within a soccer match. When the ball goes out of play, it indicates that the game has been interrupted, whether it be through a goal kick, corner kick, throw-in, or other reasons. This signals to players, officials, and spectators that the game cannot continue until the ball is back in play, ensuring that all parties involved are aware of the game's status.

In contrast, a player's goal celebration does not inherently stop play; it occurs after a goal has already been scored. Similarly, a half-time break is a scheduled pause in the match, rather than an interruption caused by events during play. Lastly, a substitution attempt does require the referee's approval, but it does not directly stop play unless it coincides with the ball going out of play or a stop of the match for another reason. Thus, the situation where the ball goes out of play is the clear cause for stopping the ongoing match, ensuring the game can resume appropriately and fairly.