Overtime (OT) or extra time (ET) is a tie-breaking method used in various sports. If the scores are equal after the regular period of play has ended, an additional period of play - the 'overtime' or 'extra time' period - is contested to determine the winner. In some sports, this extra period is played only if the game is required to have a clear winner, as in single-elimination tournaments where only one team or players can advance to the next round or win the tournament and replays are not allowed.
The rules of overtime or extra time vary between sports and even different competitions. Some may employ "sudden death", where the first player or team who scores immediately wins the game. This rule is sometimes known as golden goal. In others, play continues until a specified time has elapsed, and only then is the winner declared. If the contest remains tied after the extra session, depending on the rules, the match may immediately end as a draw, additional periods may be played, or a different tie-breaking procedure such as a penalty shootout may be used instead.