Ultimate Guide to World of Warcraft Stats and Attributes - Attack Power, Armor Penetration, and Spellpower Explained

Attack Power is a melee stat that effects how hard you hit for. Spellpower does the same thing, only for spell casters. Armor Penetration allows a player to ignore a percentage of a target's armor, therefore hitting harder. All of these things are extremely important for DPS classes, and knowing how they work and how much of each is recommended is crucial.