What are "extra time" and when is it played?

"Extra time" refers to the additional periods of play that are used to determine a winner in knockout rounds of a tournament when the score is level at the end of the regulation 90 minutes. During knockout matches, if the teams are tied at the end of regular time, they move into extra time, which consists of two 15-minute halves. This format is implemented to avoid leaving the outcome of the game to a penalty shootout unless absolutely necessary. It is a crucial aspect of tournament play because it provides teams with the opportunity to break the tie and continue competing for advancement in the tournament.

The other choices do not accurately define "extra time" as recognized in soccer. Additional time for substitutions, time before the match starts, and time given for injuries are all important aspects of the game but do not relate to the specific concept of "extra time" intended to resolve tied games in a knockout format.