1. jpeg file is a lossy raster file format that compresses an image to make the file smaller
raw contains all the uncompressed and unprocessed image data captured by the sensors of a digital camera or scanner.
2. Raw is bigger.
3. Yes you can. Software such as adobe photoshop enables you to process RAW files, edit, and export as, for example, a JPEG or PNG
4. shooting in raw would be a better pick because when you do shoot in jpeg they do come out smaller.