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A digital single-lens reflex camera (also called a digital SLR or DSLR) is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film.
DSLRs use the same design as the 35mm film cameras of days gone by. A mirror inside the camera body reflects the light coming in through the lens up to a prism (or additional mirrors) and into the viewfinder for you to preview your shot.