What is the purpose of a Domain Name System(DNS)?
A network lookup service, the Domain Name System (DNS), provides the ability to map domain names to a specific IP address. The purpose of domains is that humans better remember names than arbitrary strings of numbers. It also allows an entity to change its IP addresses or reassign them without having to notify anyone except their DNS server. Another reason for DNS is to allow, for example, a web site to be hosted on multiple servers (each with its own IP address) which allows for rudimentary load balancing.
