This allows you to load books in the ePub format (this is an open eBook format) onto your device from a variety of publishers. Most eBook readers will support commonly used Web, text, music and image formats (HTML, TXT, MP3 and JPG). It's quite important to check that the eBook reader you choose can be used with Adobe Digital Editions, otherwise you will not be able to read any content that uses anti-copying protection (most books sold online use anti-copying protection, sometimes referred to as Digital Rights Management or DRM).
In addition to displaying text, some eBook readers can double as a decent photo viewer
Bookmarks, storage and PDFs
When using your eBook reader, as with when you read a paper version of the book, you want the reader to know where you are up to (even if you fall asleep with it on your lap, or it switches off). A digital bookmark if you will. Ideally you want the eBook reader to be able to remember where you are at in multiple books, as you may read more than one book at once, or share the reader with someone else.
Check if the eBook reader comes with additional storage
eBook readers are great for voracious readers as you can store so many books on one slim device, but you need to consider how easily you can navigate the books. Some eBook readers will offer tonnes of storage space, giving you the ability to store many, many books. Does the eBook reader have an index page listing the books alphabetically by author or title? Can you skip forward a few pages when browsing through the index to browse the content, as you would skim a book? Check how easy it is to navigate for the content you want to read, before you decide on a particular eBook reader.