The Kindle uses its own format for ebooks but it is also capable of showing PDF files.
Please see Sending Personal Documents to Kindle Devices
To get a PDF file to your Kindle, you just have to attach it to an email message and send it to the Send-to-Kindle e-mail address (this is the address listed on the Settings page under Device email). If your Kindle has a wifi connection, the document will then be transferred to the Kindle over wifi (or, for a fee, by 3G if wifi is not available).
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