The Deep Web

The Deep Web (also called Deepnet, the invisible Web, DarkNet, Undernet, or the hidden Web) refers to World Wide Web content that is not part of the Surface Web, which is indexed by standard search engines.
The deep web is usually defined as the content on the Web not accessible through a search on general search engines. This content is sometimes also referred to as the hidden or invisible web.

The Web is a complex entity that contains information from a variety of source types and includes an evolving mix of different file types and media. It is much more than static, self-contained Web pages. In fact, the part of the Web that is not static, and is served dynamically "on the fly," is far larger than the static documents that many associate with the Web.

The concept of the deep Web is becoming more complex as search engines have found ways to integrate deep Web content into their central search function. This includes everything from airline flights to news to stock quotations to addresses to maps to activities on Facebook accounts. In the screenshot below, notice the various deep Web sources offered by Google, including images, maps, news, video, shopping, scholarly content, blogs, and so on. However, even a search engine as far-reaching as Google provides access to only a very small part of the deep Web.

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