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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.
A 20-megapixel DSLR has much larger pixels than a point-and-shoot of the same resolution. These larger pixels allow the sensor to be set at a higher sensitivity, measured numerically as ISO, without creating as much image noise.