Stuffit, or .sit, is a format used to compress files, primarily for the Macintosh operating system. (An example of a popular Windows compression is .zip.) These formats reduce the sizes of video, music and software files so they take up less space on storage media and so they can easily be downloaded from a Web page. However, to use these files, you need to open (decompress) them. Fortunately, even PC users can decompress a .sit file. Tips Writer Bio
