Why would a master zone use forwarders ?

[Mik J]

Hello,
If my DNS is master/slave for a zone, why would I want it to use forwarders.
In other terms why would I wantzone "mydomain.com"
{
        type master;
        file "zones/master/com/mydomain.com";
        allow-update { acl; };
};

Instead of (forwarders {};)zone "mydomain.com"
{
        type master;
        file "zones/master/com/mydomain.com";
        allow-update { acl; };        forwarders {};};
Why would I want to forward requests if I'm autoritative for the zone ?
Thank you for those who can hightligh this point.
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