Definition: A DNS server is a computer server that contains a database of public IP addresses and their associated hostnames and in most cases, serves to resolve the former to the latter as requested.
In more easy to understand terms: a DNS server on the Internet is the device that translates that www.about.com you type in your browser to the 207.241.148.80 IP address that it really is.
The nslookup command is used to query your DNS server.
Also Known As: name server, nameserver, domain name system server
Examples:
"I thought my Internet connection was completely down, but it turned out that it was just DNS that wasn't working properly. I changed the DNS servers in my router to temporarily fix the problem."
