JPGs are a semi useful file type. When you save an image as a JGP you reduce the quality of the image which is bayd, but you get a much smaller file which is good for delivery to the internet or another person. Ideally we wouldn't want to do this but it's a necessary evil. You also have the option when you ask Photoshop to save for the Web to reduce the quality even further then it normally would. The images up top from left to right have their quality set at 0%, 60% and 100% detail preserved. Again we wouldn't normally want to do this but when you have to make an image that can be accessed by every one (including people still using computers from the 1990s) you have to sometimes make sacrifices.
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