Photoxels' Understanding RAW File Format Tutorial
The Canadian digital photography website Photoxels have published an excellent tutorial about the RAW file format.
“Some photographers have mistakenly thought that RAW allowed them to correct exposure errors. Well, to a limited extent, that is true.
However, a picture has to be correctly exposed, whether you are using RAW or not. You cannot take a grossly underexposed or overexposed picture in RAW, and expect to be able to “correct your mistakes.”“