To properly answer "What is a Digital SLR?" we to understand a bit about the mechanics of a Single Lens Reflex camera.
Here is a simple diagram;
1. Light passes through the lens and strikes a mirror (green).
2. The mirror reflects the light up to a focusing screen
3. Light passes through the focusing screen and enters a block of glass called pentaprism (orange)
4. The pentaprism reflects the image so that you can see it in the viewfinder
5. when you take the photo, the mirror flips up and a shutter (blue) opens the exposes the digital sensor (red) to the light.
This is a great example of what-you-see-is-what-you-get. by using the viewfinder you can precisely compose your image and adjust the focus.
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