Digital SLR comes from digital single lens reflex, which is named this way because of the mirror that sits behind the lens of the camera and sends the light to the viewfinder.
The digital SLR’s are designed in such a way that you can use a lot of different lenses, with different focal lengths. This versatility is the reason why digital SLR cameras are so popular among professionals. When you’re using a camera that is not a SLR, you need to match the angle of the viewing lens with the angle of view. If you’re doing short-range zoom or you have a fixed lens, then it’s OK, but at different focal lengths it can be much more difficult. The SLR is better because the viewing and taking lens are the same.
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