A PDF is a digital copy of a book or magazine that you can read on your computer or handheld device. This type of file does not have pictures or video, but it has text and images for you to view.
A Kindle file is designed specifically for use on a Kindle device. To read this type of file, you must have a personal computer or laptop with an Internet connection and either an Amazon Kindle Reader application installed or an Adobe Digital Editions reader installed with an account at Amazon.com.