Library 2.0 is a loose term used to describe the changing face of the modern library. This points to a library that is now much more than just a depository for books. Though books and book borrowing are still important in libraries, the term "library 2.0" reflects the concept of a library that embraces new technologies (such as online downloads, along with the likes of DVDs and audio recordings), and that reconsiders its traditional use of public space. The modern library must also be one that is adaptable to change, and that encourages participation and feedback from its users.
Expanded descriptions of the term "library 2.0" can be found via the following links:
http://www.ala.org/tools/atoz/library-20
https://en.wikipedia.org/wiki/Library_2.0