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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.
SLR stands for single lens reflex. Basically it means you get a real time image. The light (image) goes through the lens to the mirror and is then shown in the view finder. What you see is what you get. D-SLR camera (Digital-SLR) generally lacks a realtime LCD preview, since the mirror is in the way, although newer DSLR cameras do offer the ability to offer the traditional preview like a standard digital.