Talents
Once a character achieves tenth level, it will begin earning talent points at the rate of one per level. Talent points can then be spent at the Talents window. Every class has three lines of talents, not including a character's racial talents list.
Talent points can be spent to purchase talents, which can do a variety of things. Many talents can improve your class' existing abilities, give you new abilities, or improve your class skills. All classes have the same talent options, but no single character can hope to acquire every single talent. Thus, there are many talent choices open to your character, and your choices will help differentiate you from other players playing the same class.

Choosing Talents
Every class has three categories of talents that are organized by your class abilities. Mages, for instance, rely primarily on their spells, which are broken up into the arcane, frost, and fire schools. Thus, the mage's talent categories are arcane, frost, and fire. Each category can be accessed using the tabs at the bottom of the Talents window. Talents are bought on a one-to-one ratio. One talent point spent on a talent gives you one rank in a talent. You do not accrue talent points until you have advanced past the first few levels of gameplay.