What is a Domain Name Server or Domain Name System (DNS)?
Dns means domain name server. It is the smartest way to find a website .You cannot remember many website ip address at same time.So domain name is used for remembering the website.For example 74.125.239.17 is one ip address of Google.com.It is very difficult to remember always.So you can use domain name to view the particular website. the conversion of domain name to ip address is done by DNS .If you want to find domain to ip,ip to domain,dns record details you can visit this site WhoisXY.com here you can get all the information.
Domain Name System (or Service), is an Internet service that translates domain names into IP addresses. Because domain names use letters instead of numbers, they are easier for people to remember than IP addresses (instead of remembering 207.113.108.80, people can remember www.nber.org). The Internet however, really uses IP addresses. Therefore, every time you use a domain name, a DNS service must translate the name into the corresponding IP address.