Resolution
Name servers are adept at retrieving data from the domain namespace. They have to be, given the limited intelligence of most resolvers. Not only can they give you data about zones for which they’re authoritative, they can also search through the domain namespace to find data for which they’re not authoritative. This process is called name resolution or simply resolution.
Because the namespace is structured as an inverted tree, a name server needs only the domain names and addresses of the root name servers to find its way to any point in the tree. A name server can issue a query to a root name server for any domain name in the domain namespace, and the root name server will start the name server on its way.
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