SELF-TIMER.
Not all cameras have a built-in self-timer. This device is used, among other things, to "immortalize” photographing in a group of friends. When an unsteady tripod vibrates when the trigger is pressed, this can be prevented by using the self-timer; before the shutter starts, the vibration will stop. With the self-timer, the photographer can take a self-portrait. Often, when taking landscape photos, the photographer needs staffage. Then you can set the camera on a tripod or, for example,. use yourself on the rock block (in profile or from the back) as staffage enlivening the landscape. This is especially useful in the mountains.
Situations happen often, when the photographer wants to be in a group of photographed people and then the self-timer is necessary.