RAW means the camera does no internal processing before writing the image to your media card; it records all of the information exactly as it comes off the image sensor. Allows you MUCH greater flexibility in post-processing/editing; you can play with the white balance, tint/tone, exposure, etc.
Basically, any setting you can adjust on your camera that affects the final image, you can adjust after the fact, sitting at your computer, instead of before the image is captured.
Basically, any setting you can adjust on your camera that affects the final image, you can adjust after the fact, sitting at your computer, instead of before the image is captured.