Google Book Search is a book marketing service that sells online access to your books. Google indexes the text of your books and allows users to see a few pages of your book which match their search criteria. They can then pay immediately for online access to your book at a price set by you. Users are not able to copy pages from your book or to save it on their computer. They can only access it online when signed into their account. This complements Google's other use of the technology, which directs users to online retailers who sell your book.