A Prime lens is a lens with one focal length. they come in all different sizes but a 'normal' prime is 50mm, or 35mm on most consumer level DSLRs which have cropped sensors. Prime lenses are usually cheaper, sharper and let in tons more light with f-stops in the 1.8 range. They also have less junk in the lens to get in the way. A kit lens that comes with a camera, like an 18-55mm is filled with lens elements and everything moves in and out. A Prime just rotates internally to focus. Less junk=better pics usually.
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