Time sometimes added to the end of either half by the referee to allow for time lost due to injuries or other stoppages. The referee decides how much time to add.
during a game, the clock is stopped by the referee while any injuries that cannot be taken off the field are dealt with. After normal time is up the time wasted on injuries is added.
Additional time added to the end of each half to compensate for the stoppage of play due to injuries, wasted time, or the scoring of a goal.
Time added to the end of each half according to the referee's judgment of time lost due to player injuries or intentional stalling by a team.
Time added to the end of any period to make up for time taken for player injuries or either team's intentional delay of play. The amount of injury time added is at the referee's discretion.