A "Tap Gesture" is a common interaction method used on touchscreens, such as those found on smartphones and tablets. It involves quickly touching the screen with a finger and then lifting it off. This action is often used to select items, open applications, or activate buttons within a user interface. Tap gestures can also be combined with other gestures, like swipe or long press, to perform more complex actions. They are an essential part of the user experience in mobile operating systems like iOS and Android, allowing users to navigate and interact with their devices easily.