Gotcha, makes more sense now.An ebook is an electronic-book. From the name book, You can tell it will be a story, tutorial or some type of method. Most E-Books are very short, simple, and get the job done. Alot of these are sole on HF/LF and also leaked later at other sites (lol).
An E-Book can teach you anything from learning how to make money online, To learning how to use google seo correctly. There are lots and lots of e-books.