Files?

JPG, BMP, TIF and so on are types of files. Windows chose to use BMP (which means Bitmap) for wallpaper. JPG is a file type which offers compression in varying degrees...ie the same file takes up less space. BMP is by far the largest. There are lots of image programs which will allow you to save one image type as another (save a BMP as a JPG, for example). JPG produces pretty small file sizes, relatively speaking. Which one you use depends mostly on personal preference and what you are using the image for. Compression always results in a loss of quality, however that loss may or may not be noticeable to a human.

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