A camera wrist strap is designed to attach to your camera and slips over your wrist. In the event that you accidentally drop your camera it will sop it falling to the ground and being damaged. They can be a fixed loop or a slipped loop that will tighten on your wrist should your camera slip from your grip. Wrist straps are also good should some unscrupulous low-life try and snatched your camera from your hand whilst youa re using it.