Google the Library
See the difference between a web page and a database
Start with any search engine. As an example, we'll use Google to look for the Cannell Library at Clark College web site. Google shows the library's web site because it has "crawled" the web, found the link to Cannell Library web site, and added the link to its own database.
Now use Google to find a book in Cannell Library:
Zero hits. A search engine cannot "crawl" the library's database of books (book catalog). The library's web site is part of the open Web. The library's catalog is in the deep Web. Next >>