Deep Web Links or the Hidden Web is a part of the World Wide Web but the fact is that their contents are not indexed by the standard search engines like Google, Yahoo, Bing, etc. When you talk about the surface web, it is the normal contents that are indexed by all the search engines and accessible to all the users who are using the Internet.
Then you may think about how the contents from the deep web are normally accessed by a user. The contents of the deep web can be accessed directly via website URL or by the IP Address of the website. Some deep web pages may require a password to access the particular page.
You may wonder what kind of data is found in deep websites, The data are like highly confidential emails, important bank statements, direct messages, photos shared on Facebook (which is uploaded privately). Normally the Governments and the Research people store the highly valuable data on deep websites. This makes the data unavailable to the public network.
There are many methods used to hide the webpages from the normal search engines, below are some of the methods which are used to prevent the traditional search engines from indexing the web pages.
Limited Access Content: In this method, sites limit their access to the webpages in a more technical way. that is either by using a Robots Exclusion Standard or CAPTCHA, which prevents the traditional search engines from accessing them & creating the cached copies.
Private Web: Sites that require the user name and password to access the webpages. Normal search engines are prevented from accessing them.
Unlinked Webpages: The webpages which are not linked by the other pages. Usually, these pages are not crawled by search engines. The Google Crawler will normally follow the links from particular webpages and will discover the new webpages that are linked to it, This process continues and search engines discover the new webpages. When the new webpages are not linked by any other webpages, then they are hidden or prevented from crawling. These webpages can also be called pages without backlinks.
Software: Some webpages on the internet are hidden intentionally. These hidden web pages can be accessed only via software like Tor, I2P, etc. Even some other darknet software can be used to access these webpages. By using the Tor Browser you can access the webpages by using the anonymous IP’s which change more frequently.
Non-HTML/unformatted contents: In this type of webpages, the contents are hidden in the multimedia files or in the non-HTML formats which are not supported or read by the traditional search engines. Learn Basics of HTML.
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