In tennis, a serve that is not touched by the receiver is termed an ace. An ace typically occurs when the server delivers a powerful and accurate serve that lands in the service box, making it impossible for the opponent to return the ball. Aces are celebrated for showcasing a player’s skill and ability to serve effectively, often leading to quick points during a match. Professional players often strive to increase their total number of aces, as it can significantly impact their success in tournaments.