Resource records contain the information that a zone maintains about the resources (such as hosts) that the zone contains. A typical resource record consists of the name (host) of the resource record owner, information about how long the resource record can remain in the cache, the resource record type (such as a host (A) resource record), and data that is specific to the record type (such as the host's address). You can add resource records directly, or they can be added automatically when Windows-based, Dynamic Host Configuration Protocol (DHCP)–enabled clients join a network—a process that is known as dynamic update.