Originally Posted by simico 
PP means post processing, which is further altering/modifying (processing) an image after it has been taken.
So when has an image been "taken"? (I'm probably opening a real can of worms here...
)
I suspect that many would argue that an image is "taken" when the light hits whatever kind of photosensitive material you're using to record the image. In the case of digital, the light produces electric signals in the sensor, which are then
processed by the camera. By this logic, even an unaltered raw file is processed to some degree.
It's not a matter of whether the image is post processed or not, it's how much it's been processed,
and by whom. Many people are very happy to let their camera do the processing, and shoot jpg. Others are tinkerers, and enjoy doing as much of the processing as they can, so they shoot raw.
Julie