The computer would use numbers rather than symbols, but the basic principle is the same. In reality, of course, the situation is much more complex. It would then assign each of these collections of letters a more concise symbol.
For example, if you save a document containing the text, “sell now, sell used electronics, sell Apple products, sell used Apple computers,” the compression program would notice that the word “sell” occurs more than once. When a file is zipped up or stuffed, the computer looks for repeating patterns that it can represent more concisely. However, OS X can now handle many compressed formats itself.
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Compared with ZIP files, StuffIt archives are better at squashing data to the smallest possible size. StuffIt Expander was included in OS X up to version 10.3. StuffIt was once the most widely used compression format on Macs. Words and numbers are types of code, so a minor change can completely alter their meaning.
Sound, video, and image files can withstand degradation through file compression, but you could never perform the same techniques on a text or a number document. You can’t take a compressed music or image file and turn it back into the uncompressed original. Unlike lossless compression, this is a one-way process. With lossy compression, the computer applies ingenious methods of picking out which bits of data we notice least, and discards them. This action is distinct from the lossy compression widely used for shrinking sound, image, and video files. The type of file compression we just discussed is known as lossless compression, meaning that the data that comes out when the file is unzipped or unstuffed will be identical to what you put in. To do so, select one or more files and folders, right-click, then choose Compress from the context menu. If you’re sending files by email, or trying to save disk space, the easiest way to compress them is to make a ZIP file.
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However, at some point you may be sent a StuffIt file, in which case you’ll need a free application called StuffIt Expander to open it. Double-click the file, and a new unzipped version will appear next to the original.
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Your Mac can open most of these types of files without using any extra software. There are many different compressed file formats. Compressed Files Opening Compressed Formats
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