Deep Web sites tend to be narrower with deeper content than conventional surface sites. Total quality content of the deep Web is at least 1,000 to 2,000 times greater than that of the surface Web. Deep Web content is highly relevant to every information need, market and domain. More than half of the deep Web content resides in topic specific databases. The deep Web is the fastest growing category of new information on the Internet.
All signs point to the deep Web as the dominant paradigm for the next-generation Internet.
Searching on the Internet today can be compared to dragging a net across the surface of the ocean. There is a wealth of information that is deep, and therefore missed. To be discovered, the page must be static and linked to other pages. Because traditional search engine crawlers can not probe beneath the surface, the deep Web has heretofore been hidden in plain sight. Any deep Web content listed on a static Web page is discoverable by crawlers and therefore indexable by search engines.