Goal difference - Wikipedia
https://en.wikipedia.org/wiki/Goal_differenceGoal difference, goal differential or points difference is a form of tiebreaker used to rank sport teams which finish on equal points in a league competition. Either "goal difference" or "points difference" is used, depending on whether matches are scored by goals (as in ice hockey and association football) or by points (as in rugby union and basketball).
Goal difference - Wikipedia
en.wikipedia.org › wiki › Goal_differenceEarly example of goal average being used to compare the performances of football clubs (March 1885) Goal difference (or points difference) is calculated as the number of goals (or points) scored in all league matches minus the number of goals or points conceded, and is sometimes known simply as plus–minus.