Red dot scopes are scopes that are battery powered; can be used on pistols, shotguns, and rifles; and are good for close range shooting. They project a laser on the lens of the scope and are meant to be used with both eyes open. The laser is not projected to the target. They are meant to be used for quick acquisition and faster shooting with more accuracy. These are the type of scopes used by the world's top unlimited class shooters.

View from the shooting end of a red dot optic sight: