It depends on the age level:
Middle school usually plays best out of 3 sets; in the first two sets, 21 points are needed to win and the 3rd set plays to 15 points. (So, either 42 or 36 points are needed to win a match.)
High school freshmen and JV teams play two games to 25 and a third to 15 if needed. (So, either 50 or 40 points are needed to win a match.)
High school varsity and all college teams play to 25 points except for the fifth set, which is played to 15. (So, either 75 or 65 points are needed to win a match.)
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The required amount is to win by 2 points, though you can win by more; it also depends on whether you're playing to 15 or 25
25 points by a two point margin. If one team has 24 and the other has 25, the game keeps going until the two teams are at least two points apart.