The Deep Web
If the Surface Web is the indexable part of the internet, the Deep Web is everything else. The Deep Web is the area on the internet that can't be, or isn't, indexed. And it's much, much bigger. This is because the Deep Web includes much more than what you probably think. Remember—the internet isn't the World Wide Web (Surface Web). It's the infrastructure over which the Surface Web is accessed. So, the Deep Web (most of it, anyway, but we'll talk about that soon), also exists on the internet. Any website or system that requires login credentials is part of the Deep Web.
Organizational information and intranets of businesses, academic institutes, governmental departments, and others, are also part of the Deep Web, as are websites ...
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