A forward lookup zone is a DNS zone in which hostname to IP address relations are stored. When a computer requests the IP address of a specific hostname, the forward lookup zone is queried and the result is returned.
A reverse lookup zone does just the opposite. When a computer requests the hostname of an IP address, the reverse lookup zone is queried and the result is returned.
Also, it is possible to have secondary forward lookup zones when using active directory integrated DNS. The secondary zone won't be ADI, but the primary zone from which it pulls can be. Also, DNS zone can only be Active Directory Integrated if the DNS server on which they reside also happens to be a domain controller. If your dns server isn't a domain controller, the zones aren't ADI, just standard forward lookup zones.
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