Many professional photographers like to shoot in both raw and JPEG. It’s not unusual to use dual card slots to keep the files separate. Shooting in this way means that they can quickly deliver JPEGs to a client on-site and have the raw files available for more extensive edits for the final delivery. The file format that a pro uses depends a lot on what they are shooting and how quickly it needs to be delivered. Many news photographers only shoot JPEG for fast delivery, while someone working in a studio doing still life or beauty work may only shoot in raw.