Final answer:
The libero position is not counted as one of the 18 regular substitutions in volleyball. They have certain restrictions and are specialized in defense and passing skills.
Step-by-step explanation:
In volleyball, the libero position is not counted as one of the 18 regular substitutions. The libero is a specialized defensive player who can replace any back-row player without counting as one of the substitutions. They wear a different colored jersey and have certain restrictions regarding their offensive abilities.
The libero is often utilized in high-level volleyball to enhance the team's defense and passing skills. They are responsible for receiving and passing the ball effectively, allowing other players to focus on attacking. Their unique status allows them to play freely without being counted as a regular substitution.