Authoritative DNS
Each domain has at least one authoritative DNS server that publishes information about that domain and the name servers of any domains subordinate to it. The top of the hierarchy is served by the root nameservers, the servers to query when looking up (resolving) a top-level domain name (TLD).
An authoritative name server can either be a master server or a slave server.
Authoritative DNS is the type of DNS that controls the DNS records for a particular domain. For instance, for serverbuddies.com the authoritative DNS servers are ns1.serverbuddies.com and ns2.serverbuddies.com. They only respond to domains they are in charge of.
Contrast this with Recursive DNS are those servers which will give you and answer for any thing. (Google.com, yahoo.com)
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