What does the term "invisible Web" refer to?

The "invisible Web" is a subscription service available only to libraries and schools.
The "invisible Web" refers to a large portion of the Web that regular search engines cannot find.
The "invisible Web" is made of libraries that have scanned their books and put them online.
The "invisible Web" is a database that can be accessed only through the Library of Congress.

Respuesta :

The term invisible Web refers to a large portion of the Web that regular search engines cannot find. It would appear invisible to the regular user of the Internet.

I believe the answer is: a large portion of the Web that regular search engines cannot find


The websites that is shown when you enter your keywords from search engine would already be filtered to hide explicit materials that might be seen as disturbing by most people. To access this, you need to use independent browser such as Tor