This is the file sort you capture your photos in. This is a setting you select in your camera. The standard file extension is a JPG/JPEG, so if you don't know what you shoot, it's probably JPG/JPEG. A RAW-file has a lot more information in the file, therefore the files are a bigger size. Some examples of filename extensions for RAW-files from famous brands are: .ARW (Sony) .DNG (DJI and Adobe, if you shoot with the camera in the Lightroom app) .GPR (GoPro) .CR2/.CR3 (Canon) . NEF (Nikon) These RAW files need to be processed (in for example Lightroom) before you can print/send them or upload them to social media for example. Because the RAW files are so rich in information, it's easier to edit these photos as there are more details in the highlight, shadows, and colors.