variants: or less commonly Deep Web
Definition of deep web
: the set of web pages on the World Wide Web that are not indexed by search engines but that may be viewable in a standard Web browser (as by logging in to a website) The deep web is everything that is not indexed by search engines, including pages behind paywalls, password-protected information, or closed intranets. Personal information that only you can access though your bank's website, for example, is part of the deep web.— Eileen Ormsby — compare dark web
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