Aion offers a choice of four classes for starting players, who then at level 10 advance to two further specialized classes. Here is the introduction about them , please read it on ...

Warrior

Warriors specialize in close combat, utilizing their great physical strength and prowess. They exhibit a wide range of dazzling battle skills other classes cannot perform, though Warriors are relatively easy to play.

Gladiator
A Gladiator lives and dies by the sword. They are skilled in using a variety of weapons and can master a mixture of fighting techniques tailored to the characteristics of their weapons.
Templar
The Templar acts as a guardian, fighting with a sword in one hand and a shield in the other. Templars can use a chant or incantation to protect and heal allies, but also serve as front line fighters.

Scout

Scouts provide the best variety of play styles of all the basic classes. They benefit from great agility and can make speedy attacks, though how well they perform varies, depending on the player. The scout is an extremely versatile class.

Ranger
Rangers are expert archers and are a natural with a bow. They are also capable of using other weapons like swords and daggers, and are adept at observing and utilizing their surroundings. They can survive in the harshest of environments.
Assassin
The assassin is an expert in silent movement and quick termination of the given target. Though not considered true warriors, Assassins are valued for their deadly skills and stealthy nature. Their skills are considered formidable.

Mage

Mages rely on their mastery of magic to deal large amounts of damage at long range. They are comparatively weak at close combat, and it is important for them to learn how to divert and evade the enemy.

Sorcerer
The Sorcerer follows the path of magic, mastering the elements of water, fire, aion kina and earth. They channel powerful magic in combat through their understanding of the true nature of the Aether. A Sorcerer