What is Domain Name System (DNS)?

• DNS server is computers that translate the domain name of another computer into an IP address a vice versa on request.
• A set of servers called domain name servers (DNS) maps the human-readable names to the IP addresses. These servers are simple databases that map names to IP addresses, and they are distributed all over the Internet.
• There are two kind of computer address: IP address(192.168.46.34), domain name(www.abc.com)
• The browser contacts a DNS server to get the IP address. A DNS server would start its search for an IP address by contacting one of the root DNS servers. DNS is the primary system used to resolve host names on the Internet.
• The Domain Name System was first introduced in 1984.
• With DNS, the host names reside in a database that can be distributed among multiple servers
• The name system is based on hierarchical names in a tree-type directory structure.
• Domain names follow a format of domain name system.
• The Internet Network Information Center (InterNIC) controls the top-level domains.