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In short, RAW is a higher quality image at the cost of larger file size. JPEGs are compressed, smaller and lower quality. If you edit your photographs, you can do so much more effectively with RAW images than JPEGs. It’s not entirely something only professionals can benefit from, but if you are a fairly serious photographer that makes use of Photoshop, it probably doesn’t matter to you whether your current smartphone utilizes RAW format or not.