if you shoot in raw and down load onto your computer ... double click on the RAW/NEF file and it will open in photoshop or your selected editing program now you have your image open in a box where you can tweak the colours etc.... this box is your RAW converter! then click open and it opens as normal in your editing program! there is a huge quality difference in RAW and JPEG but most people do not seem to see it. The majority of Professionals shoot in RAW which means they do the processing of the image rather than the camera .... it gives a wider range of editing choice and with minimum to nil image quality loss... where as editing a JPEG causes some image quality loss that is plainly visible to the naked eye.
magazines agencies and anybody in the photography world will require you too shoot in RAW and save as a TIFF file.
Also you can open your raw file over and over again, JPEGS loose quality in time.
All this being said JPEGS are good when you need to produce quick results
i would encourage people to learn to use RAW as soon as they can as you will kick yourself later if you don't.
when your editing techniques improve you can go back to the RAW file and try again which unless you have made duplicates of you JPEG you cannot do...

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