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Part: 3 Wrapping Up > What, Exactly, Is Compression?

What, Exactly, Is Compression?

Whether you realize it or not, your Mac probably uses compression nearly every day. Almost anything that comes with an Installer uses compression, and many file formats, such as GIF, JPEG, and PDF, have built-in compression and decompression. If you've ever seen StuffIt Expander doing its thing on your Mac, chances are it was decompressing a compressed file.

So what's this compression thing all about? Do you care? Do you need to care?


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