Most people take photos in Jpeg format. It sort of works. However if you have the option to shoot in RAW it can save the day. So you find yourself in say Jordan at Jerash... a group are just demonstrating what it is like to be a gladiator. You set your camera to 1/40th of a second to get a bit of blur from the swords and the action... but its wrong. Its too bright and as these things are over quick all your photos are rubbish, see below. However by shooting in RAW and then using some software all is not totally lost. I have worked at the extremes of the camera and software, ok just my abilities, I am sure others could do a lot more. But here we have a photo cropped and edited, 5 minutes work and we have something that captures the essence of the event, see below. Not as good as I would like but hopefully an example of why you should consider shooting in RAW.
All the best