deep web; invisible web
Refers to parts of the internet not indexed by standard search engines, such as private databases, academic archives, and subscription-only content. Distinct from the 'dark web' (ダークウェブ), which is intentionally hidden and often associated with illegal activities.
See also: 深層ウェブ
The deep web contains many academic papers that cannot be found by ordinary search engines.
Library databases are also part of the deep web.
Variant with a middle dot, sometimes used to separate the two parts.
Borrowed from English 'deep web', referring to web content not indexed by standard search engines.