Volleyball rules vary across high school, college, and professional levels.
In high school, matches are best-of-five sets, with each set played to 25 points, except the deciding set to 15.
College volleyball also uses the best-of-five format, but with more stringent rules on ball handling and substitutions.
Professional volleyball, such as in the FIVB, often features best-of-five matches as well, but with a focus on higher technical skill levels and fewer substitutions. The pro level also includes advanced rules like the challenge system for contested calls.
These differences ensure the game is suited to the skill levels at each tier.