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The deep web is a term to describe all of the Internet connected networks, web sites, and services which are not indexed by major search engines such as Google, Yahoo, and Bing. They may not be known to exist simply because the Internet is so extremely large. There is far more content online than that which is known and indexed by the major search engines. Search engines only index and search common Internet protocols such as http which makes up the World Wide Web. And finally, there are Internet connected networks which have restricted access blocking Internet search engines and indexing services. Public access to an Internet connected network or web site may be completely blocked by encryption, authentication mechanisms, and firewall technology.The deep web is a term to describe all of the Internet connected networks, web sites, and services which are not indexed by major search engines such as Google, Yahoo, and Bing. They may not be known to exist simply because the Internet is so extremely large. There is far more content online than that which is known and indexed by the major search engines. Search engines only index and search common Internet protocols such as http which makes up the World Wide Web. In other words, you have to "dig deeper" to find the deep web. Furthermore, there are Internet connected networks which have restricted access blocking Internet search engines and indexing services. Public access to an Internet connected network or web site may be completely blocked by encryption, authentication mechanisms, and firewall technology. In this case you have to dig deeper by getting a password from someone or being granted access.