Hunters are the only ranged DPS class in World of Warcraft that use non-magical means to do damage. Hunters are dangerous on the run and rarely will a skilled Hunter be standing still in PVP combat. Here are three great Hunter PvP specs for Warcraft 6.0.3, with discussions of how the patch has changed the hunter.
Hunters are pure ranged DPS and no longer require melee weapons at all. In earlier iterations of World of Warcraft the Hunter had a "Dead Zone" where they could not fire their weapons and needed to draw melee weapons to attack or defend. This is no longer the case and point blank damage can be done with guns and bows.
The hunter is available to most races and uses Mail armor. Hunters may choose between bow, gun, or crossbow as a weapon.