A self timer is a device on a camera that gives a delay between pressing the shutter release and the shutter's firing. It is most commonly used to let the photographer to take a photo of themselves, hence the name.

How does self timer work?

A self timer is an automatic shooting mode that counts down and then takes a photo. ... Once the shutter button is pressed, a series of beeps emit from the camera as it counts down to taking the photo.

What means self timer?

: a delayed-action shutter-tripping device often built into a camera that permits the photographer to be included in a picture.