The term "goal margin" refers to the difference in goals between two teams or sides competing against each other. In sports such as soccer, basketball, and hockey, a goal is scored when a player on one team manages to get past the opposing team's defense and shoot the ball into their net. The number of goals that are scored by each side during a game determines the final score.
The "goal margin" refers specifically to the difference between the total number of goals scored by one team, and the total number of goals scored by their opponents. For example, if Team A wins a soccer match against Team B with a 3-0 scoreline, then the goal margin is 3 goals (the difference between the number of goals they scored and the number of goals conceded).
In some sports, such as football or basketball, the term "goal differential" may be used instead. This refers to the same concept - the difference in points scored by one team compared to their opponents - but is calculated using a different system depending on the sport.