There are 3 layers of web on the Internet.
1. Surface Web.
2. Deep Web.
3. Dark Web.
Surface Web :- The Surface Web is that portion of world wide web which is available for normal Internet Users. This is only 10% of the whole Internet. You can surfe this web by normal search Engines like Google , Chrome , Firefox and etc.
Deep web :- The Deep Web is also the part of world wide web but including content which is not indexed on Search Engines.In Simple words, you can not search Deep Web content by using Google or Chrome. For Instance :- Data that companies store on their private databases. The user can only access if user has TOR Browser.
Dark Web :- The Dark Web is the dangerous place on the Internet that is termed as dark web or dark net. All criminal activities are impacted on the dark web. Criminal Activities like Drug Dealing , H1tm4n Hiring , Illegal weapons and etc.