The name digital SLR is short for Digital Single Lens Reflex,it is named that way because these types of cameras use a mirror situated at the back of the camera lens to direct light toward the viewfinder when you're composing a photo. When you release the shutter, the mirror swings rapidly out of the way, letting light from the lens travel straight to the sensor and momentarily blacking out the viewfinder. The viewfinder in an SLR includes a prism--usually a pentaprism--that flips the incoming image around so that you can see it right side up and bounces it onto the focusing screen where you see it.
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