It depends on what someone has in the way of a "viewer". A RAW (NEF) file is an close to unprocessed data as you can get from the camera, in film terms this is similar to undeveloped but exposed film. The JPG has already been "developed" in the camera, based on the camera settings. In both cases, further processing of the image can be done in programs such as Photoshop. From this you can save to many different formats, JPG is one of the standards that can be viewed by almost everyone.so does a RAW only have to b converted back to a JPEG for someone to view or print off a CD, is that what it is ???