DNS (Domain Name System): It is made up of resolvers and name servers.
Websites on the Internet exist one server at a time, but how do users get to the web server they want to visit? This will need to assign an IP address to each server, the Internet's infinite number of Web sites, the user can not remember the IP address of each site, which produces a convenient memory of the domain name management system DNS.
DNS servers are (Domain Name System or Domain Name Service) domain name system or domain name service, the domain name system for hosts on the Internet. The system assigns domain name addresses and IP addresses to hosts on the Internet. Users use the domain name address, the system will automatically convert the domain name address to an IP address. A domain name service is an Internet tool that runs the domain name system. The servers that perform domain name services are called DNS servers, and DNS servers are used to answer queries for domain name services.