Domain Name System In Distributed System. Its purpose is to provide a layer of abstraction between Internet services web email etc and the numeric addresses IP addresses used to uniquely identify any given machine on the Internet. This means that there is no single name server that knows about every single domain on the Internet.
The DNS database is a general-purpose distributed hierarchical replicated database. Instead this information is spread out all across millions of servers all across the Internet. 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.
To solve this problem the DNS system was introduced.
DNS which stands for Domain Name System is used as the medium to translate domain names to their respective IP addresses when a client initiates a request query. DNS is a host name to IP address translation service. DNS can be best compared to a phone book where you look up the phone numbers listed by easier-to-remember names. The domain name system DNS is a naming database in which internet domain names are located and translated into internet protocol addresses.