Some people confuse rifle scopes with gun sights. A good rule of thumb is that a rifle scope provides some level of magnification, whereas a gun sight doesn't. Both devices help shooters take aim at a target. Some sights are very simple, while others use lenses similar to a scope's lenses. Here's a brief rundown on common sight types:
Open sights require shooters to line up two sights on a rifle to aim a shot. The rear sight usually looks like a V or a U. The front sight is a simple vertical projection.
Aperture sights are like open sights, but use a ring for the rear sight. You align the front sight within the ring while aiming at your target.
Red dot sights project a red dot or other illuminated targeting reticle on top of the image of the target. The dot doesn't project out the end of the sight.
Laser sights project laser beams toward a target.
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