In tennis, a "let" refers to a situation where a point is not awarded, and the rally is replayed. Let is a common occurrence in various situations, and the point is usually replayed to ensure fairness and eliminate any advantage gained through external factors.
It's important to note that the decision to call a let is made by the chair umpire or referee, depending on the level of play. If any of the above situations occur during a point, the umpire will call "let" immediately, and the point will be replayed to maintain fairness and uphold the rules of the game.