A self timer is a camera mechanism that delays the opening of the shutter for a preset number of seconds after the shutter release is pressed. This feature allows the photographer to be included in the picture or to reduce camera shake when taking long-exposure shots.
Self timers are commonly used in group portraits, tripod photography, and creative compositions where precise timing is important. By providing a short delay, the self timer ensures sharper images and gives photographers flexibility in framing and positioning themselves within the shot.