Today's models do not have card slots, but you can get the Kindle Paperwhite and Kindle Oasis configured with up to 32GB storage. The original Kindle had a port that allowed users to save titles to a memory card, extending the device's capacity, but then again it only had 250MB of RAM built in. Although there's no standard size for e-books, it's safe to say that that 8GB is enough memory to hold thousands of titles. The $90 Kindle, Amazon's base model, comes with 8GB of storage. Why would you want to use an e-book reader in the first place? One reason is that a single e-book reader can hold many titles.

These factors give the Kindle a leg up on the competition. Amazon also has a large customer base, which means a big audience for e-books - and lots of publishers and self-published authors wanting to jump into that market. You can buy a book or subscribe to an electronic version of a newspaper on Amazon and download it directly to the Kindle. Because Kindles are wireless, you can access the store without connecting the device to a computer.

How to use a kindle for school