This is a HUGE topic that will be difficult to do justice to but if the question is why? Then here’s a brief answer. I might add that this question (at the moment anyway) only applies to higher end compacts, micro four/thirds and DSLR cameras. If you are using a smartphone or a compact that doesn’t give you the option of shooting in raw, then jpeg it is then. So firstly why raw? Raw is digital negative that retains all the information that the camera sensor can see but needs post processing to get the best out of it. So if you want a outstanding image and are prepared to put in the time in front of a computer to get it then shoot raw. Secondly why jpeg? This depends on what you will be doing it with it. If you are sharing on social media or via email just among friends or they are happy snaps which display memories rather than artistic merit, then jpeg is fine. Bear in mind that even if you shoot in raw you need to convert to jpeg to show or share as raw files can only be read by a small number of programs and the file sizes are pretty big. A final tip on that would be to shoot (if available on your camera) raw + jpeg so you can ‘publish’ the jpeg immediately and fine-tune the raw image later. Happy snapping!