[ingoKober]

As Alison said: The screen of your camera shows a JPG, which ist corrected for lens distortion and optimized for contrast, nise and colur. The RAW file, as the name indicates, is without any correction, so you see the full distortion of the lens and the colours as they are detected by the sensor.

In the first case, the camera corrects the distortion, in the second case, you have to do it.
Thats the idea behind RAW: You get just, what the sensor sees and can do all the fine tuning yourself.

BR

Ingo