Less than 10% of the Web is indexed by search engines such as Google and Bing. The remaining 90% is what we call the Deep Web or the Invisible Web.
Because of licensing and fee structures, most of the content in the Library databases is part of the Invisible Web.
Image: Freedom of Information Blog (November 2011)
(Credit: Gerald Lynch)
The Internet is an important tool, but you need to remember:
The CRAAP test is a useful tool for evaluating websites. Seriously!
URL = Uniform Resource Locator (website address on the Internet)