What is service ace in volleyball?

Answer 1

When the server serves the ball directly into the opposite side of the court with no player from the other team touching the ball (or they touch the ball but the second pass is unplayable).

Answer 2

An ace serve occurs in tennis when the opponent does not even get his racket on the ball as it whizzes past him.

Answer 3

for volleyball, a service ace is when you serve the ball over the net and the ball served touches the court without anyone else touching it, meaning that it was a perfect serve.