What is the deep web?
The deep web is any part of the World Wide Web (WWW) whose content is not accessible through classic web search engines such as Google or Bing. These search engines are unable or, for various reasons, do not want to include some websites in their index. This means that if you search for something on the Internet, you are actually searching throuhg is "only" in the database of the used search engine or the index. This index is only a fraction of what is on the Internet. A comprehensive infographic on "What is the deep web" can be found at whoishostingthis.com.