One of the big decisions about publishing your book has to do with whether or not you want to release physical copies or simply stick to electronic copies. Once you have decided to print physical copies of your books, you have to decide whether or not you want a dust jacket to be a part of your book or not.
Years ago, when a dust jacket was used, it presented a different cover image that was more elegant and attractive to readers. This was due to the limited functionality of printing presses of the day. In the past, the cover under the dust jacket would be course and imageless. At that time, books were something of a luxury. They were valuable and needed protection, which the dust jacket served to provide quite well. Books also used to be made from fabric which was easier to damage than our modern books made of cardboard, so dust jackets served more of a purpose in that regard as well.