Every agency or corporate recruiter is using LinkedIn as a primary tool. It’s simple, fast, and you can reach candidates pretty easily. Other recruitment sources are job boards, Google, and so on. But not every great candidate is on LinkedIn, for various reasons, and not everyone can be found by Google X-ray because Google is not able to penetrate the whole internet and all forums. Since technical forums are quite often password-protected and therefore invisible to Google, Bing or Baidu, you can only locate those by using Booleans and advanced operators. But you cannot always access these websites, because they are hidden in the Deep or Dark Web.
Difference between Deep Web, Dark Web and Surface Web
Everything that search engines can’t access, but is still accessible by a normal browser if you have a URL, is part of the Deep Web.
Everything that is hidden for a purpose, and inaccessible through standard web browsers, is part of the Dark Web. That is a small portion of the Deep Web.
You are visiting numerous websites every day. This part of the Internet is called the Surface Web, which you can visit through search engines. But this is only a small part of the Internet, only around 4%. But what about the remaining 96%?