DSLR vs Mirrorless Camera.

If you're considering buying a mirrorless digital SLR, then you might have already looked at some "normal DSLR too.

Latest mirrorless digital SLR from Olympus

Usually I do not bother much to comment on mirrorless digital SLR. After all, they are usually slight improvements of well-known design concepts. And I maintain the opinion that you don’t make great pictures just because you happen to have the latest and greatest camera. No, you make those fantastic shots by learning how to use a camera - just like you don’t become a race car driver until you actually learn how to drive.
However, I am making an exception to the rule here since OLYMPUS (a camera brand I am usually very enthused about) is the first, come out with a revolutionary new design concept: a digital Single Lens Reflex camera without a mirror!.The mirror has been an integral part of every advanced camera design for many decades. It enables you to see exactly what the camera “sees” through the lens, regardless of which lens and which setting you are using. The mirror reflects the light from the camera lens up to the viewfinder, where you can evaluate the scene before pressing the shutter. At that instant, the mirror swings up so that the light can now fall on the image sensor, where the picture is recorded. The next instant, the mirror swings back again.
This design has the disadvantage that it makes the camera body of an SLR a bit bulky and heavy. There have been several attempts at solving this problem, but none has been really successful.

Panasonic Lumix G1 (Mirrorless)

Here is a graphic by Panasonic, explaining the difference "one image is worth 1000 words" (photo above).
 Well....In the end, the differences between these two different types of cameras are quite minimal.However, it's worth being aware of some of the key advantages of each camera type before you plunk down your hard-earned cash.
You can always log on to MIRRORLESS vs NORMAL DSLR  more info here.