Scribd is a service that offers users access to an extensive library of books, documents, audiobooks, comics, textbooks, and much more. Read more about Scribd  

The Scribd app is an interface for the Scribd services and provides people with the means of exploring this vast library of content. The only caveat is that the service itself doesn’t come for free and it requires a monthly subscription.
One you get that subscription you will get three books and one audiobook of your choice every month, and unfettered access to the entire content library. People should be able to find pretty much anything in there, ranging from government reports, academic dissertations, detailed scientific studies to massive textbooks used in universities.
It’s also possible to only looks for things you want and to receive editors picks based on your interests.