name server
A name server is similar to a telephone switchboard. It holds the information that tells the Internet where to find your web site and where to deliver your email. Name servers look something like this: yns1.yahoo.com. You can change your name servers in the Advanced DNS area of your Domain Control Panel; however, Yahoo!'s name servers must be listed as the primary and secondary name servers in order for Yahoo! to host your domain services properly. Learn more.