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From DFO World Wiki

Dungeon Fighter Online features five primary classes. Each class bears its own unique set of fighting skills necessary to face off against the dangerous monsters and creatures that dwell in the dungeons of Arad. As adventurers rise in level, each class can specialize further into subclasses, opening up even more skills.

The five basic classes in Dungeon Fighter Online are Slayer, Fighter, Gunner, Mage, and Priest. Each class can further specialize into a second class at level 18 by completing a specific quest chain. Upon completion, the character will become the new specialized class and receive a class-exclusive cosmetic change (e.g. Berserker - glowing red eyes). At level 48, the character will awaken into a third class, gaining a few powerful exclusive abilities.

For help deciding on a class, try the Class Comparison tables.