Domain Name System Def. In simple terms a Domain Name System DNS is a collection of databases that translate hostnames to IP addresses. The domain name system maps the name people use to locate a website to the IP address that a computer uses to locate a website.
There are only a limited number of such domains. In simple terms a Domain Name System DNS is a collection of databases that translate hostnames to IP addresses. The explanation of this function can be by comparison with a telephone information service that has current contact data and provides them when someone requests them.
Techopedia explains Domain Name System DNS.
A domain name server is an individual server that is part of the Domain Name System which may be comprised of multiple domain name servers. The Domain Name System DNS is a hierarchical and decentralized naming system for computers services or other resources connected to the Internet or a private network. The domain name system DNS connects URLs with their IP address. A domain name is an Internet resource name that is universally understood by Web servers and online organizations and provides all pertinent destination information.