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Every domain in existence is linked to an Internet Protocol (IP) address. When a user enters a website into the address bar, a translation must occur between the domain that the user types in (www.example.com) and the IP address which the domain is linked. This is what the domain name system (DNS) is. There are three main DNS queries: Recursive, non-recursive, and iterative — which may be explained in the following way: Recrewable DNS queries.