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Warlocks in WoW were mages that delved too into the roots of demonic power deeply. By the way, you can earn cheap wow gold here. Consumed by a lust for dark knowledge, they have tapped into chaotic magics from beyond the world. The Burning Legion now feeds them their powers, allowing them to channel destructive energies and call upon the powerful emissaries of their demon masters."
-Blizzard Entertainment

The Warlock is a more involved class to play. Warlocks have minions, many different spell combos, and a reagent component (Soul Shard) requirement for some of their spells. This means that it will take a bit more learning than some of the more straightforward classes. The Warlock has a lot of very cool and fun abilities including Eye of Kilrogg, Fear, minions and more. The Warlock is a very fun and profeesional class to play once you figure things out.

Strengths
Can use minions for fun and to attract enemy aggression.
Can create Soulstone which allow self or resser resurrection.
Can create healing potions in the form of Healthstones.
Can summon other players using Ritual of Summoning.
Can breathe underwater using Unending Breath.
Can summon a Felsteed or Dreadsteed demon horse as a mount.
Can use Eye of Killrogg to scout.
Can take control of a Demon for a short amount of time.
Can heal themselves using Life Drain, Siphon Life, and Death Coil.
Can solo very well, by using a minion to act as a group of two characters(WoW powerleveling) complementing each others' skills.