Google Book is a tool from Google that searches the full text of books that Google has scanned and stored in its digital database. It allows users to search for books by title, author, or keywords and view snippets of text or sample pages. For books in the public domain, users can view full books online. Users can also purchase books online or find their availability at local libraries. The tool provides various features for viewing books like cover views, list views, embedded previews, contents menus, and page turn animations. It also offers improved search capabilities within books and book overview pages with additional metadata.