RAW files are like unprocessed film. The raw processing software you use to edit them is like the film developer.
DeepPRIME is a noise reduction and image enhancement process introduced in DxO PhotoLab 4. It is exceptionally good at reducing noise in high ISO images while preserving and enhancing image detail. It does need to be run as a separate process outside DxO PhotoLab's regular editing tools, however, so it is a process you can only apply as you process and export an image, not as a 'live' and reversible adjustment during normal editing.