File format that enables recording data in original form, apropos directly from sensor without any processing in camera itself. That leaves us with much bigger possibilities of prcessing photographs in for this purpose adequate programs in which we can adjust sharpness, white balace (WB), illumination, details in shadows...much better than we can do if we process JPEG or TIFF files. Of course, not everything to be perfect, we have to name some downsides of this type, and those are more memory occupation and thereby slower work of camera and especially that there is no universal RAW format because every manufacturer has different specifications, even within different models from their offer.