What Does Deep Web Mean?

The deep web refers to any internet information or data that is inaccessible by a search engine and includes all web pages, websites, intranets, networks and online communities that are intentionally and/or unintentionally hidden, invisible or unreachable to search engine crawlers.

Techopedia Explains Deep Web

Coined by Mike Bergman, the term “deep web” relates to deep sea/ocean environments that are virtually invisible and inaccessible. Technically, the deep web is a series of interconnected systems that are not indexed by search engines and only directly accessible by their creators or individuals with very limited privileges.