Talents and Glyphs
Your character class determines what abilities your character can use, but World of Warcraft provides you with two ways to customize your abilities to create a character with unique strengths.
As characters grows stronger, they earn talent points. These points can be spent on talents that let your character specialize in one specific subset of his abilities; for example, mages have access to talent trees that enhance either their frost, fire, or arcane spells.
Glyphs provide another method of enhancing your abilities. Characters learn and use glyphs (created by players with the Inscription profession) to make their abilities more powerful or even add new effects to abilities. A character can only equip a limited number of glyphs at a time, so choose carefully.