How can you get audio books on to a kindle?

I have been told you can get audio books on to the amazon kindles but nobody I know can explain simply how to get them on there or a simple way download them, any ideas? thanks (:How can you get audio books on to a kindle?
The only way to download them directly to the Kindle is if you get them from Audible.com. To sideload .MP3 files to it, connect it via USB then drag and drop audiobook files to the Audible folder, music files to the Music folder. Don't forget to safely eject before disconnecting.

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