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https://www.hitechnectar.com/blogs/introduction-surface-web-deep-dark-web/

What is the Surface Web?

Also known as the Visible Web “LightNet”, or Indexed Web; Surface Web is everything that you can find on the regular World-Wide-Web. It contains the pages that are put under “Indexable” to be readily available to its searchers in any Search Engine’s Result Page.
According to the  worldwidewebsize.com, “The Web contains minimum 5.28 billion Indexed pages (Wed, 28 Nov’18).” Interestingly enough, the Surface Web is only approx. 10% of the whole World Wide Web.
Examples of Surface Web include- Facebook, YouTube, Wikipedia, Regular Blogging Websites, and basically everything that we can see on any search engine’s result page (SERP).

Index or NoIndex?

By default, a web page is set to “Index”. However, some pages have no requirement of being in the SERP and be accessed by the others DIRECTLY. For example; Thank you Pages, a companies admin and login pages. So primarily the pages that are either intended to specific people or the pages that come after accessing a particular page on your websites come under no-index or no-follow.
The web pages shown In the search engines serve the purpose of being directly accessible and have the intent of getting better Ranking in the Engines. This is why they need to be indexed. But some internal subpages like above mentioned are merely there to support the main pages, and that’s why are set to “no-index”. This conveys the Robots and crawlers of search engines to stop right there. Furthermore, “NoFollow” disallows them to follow any particular link. This needs to be set internally.

What is Deep Web?

So, in essence, there are pages which are easily approachable but not present in the result pages of any engines. These type of pages go to the deep web. You can access them by there links (if you have them) or by visiting the page it is connected to.
Hence, you can surf the Deep web by accidentally clicking on a link. The Deep Web, Hidden Web or the Invisible Web contains what is hidden behind the HTTP forms. It furthermore includes online banking pages, medical and financial records, personal files, etcetera that are generally secured by a paywall and can only be accessed from specific pages.
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