The more you play World of Warcraft the sooner you'll notice that there is more than meets the eye in most aspects of the game, and learning effective spell rotations becomes a more important aspect of game play. Read this primer on the topic by Contributing Writer Martene Battle.

In World of Warcraft, every class starts off with 2 or so 'beginner spells spells/attacks/actions'. To keep it general, let's name them, class abilities. Over time that list of class abilities becomes longer and does more complex things.

via WoW Guide - Spell Rotations in World of Warcraft.