Warrior:

There are three different classes within the warrior group: fighter, paladin, and ranger. All are well-trained in the use of weapons and skilled in the martial arts.

The fighter is a champion, swordsman, soldier, and brawler. He lives or dies by his knowledge of weapons and tactics. Fighters can be found at the front of any battle, contesting toe-to-toe with monsters and villains. A good fighter needs to be strong and healthy if he hopes to survive.

The paladin is a warrior bold and pure, the exemplar of everything good and true. Like the fighter, the paladin is a man of combat. However, the paladin lives for the ideals of righteousness, justice, honesty, piety, and chivalry. He strives to be a living example of these virtues so that others might learn from him as well as gain by his actions.

The ranger is a warrior and a woodsman. He is skilled with weapons and is knowledgeable in tracking and woodcraft. The ranger often protects and guides lost travelers and honest peasant-folk. A ranger needs to be strong and wise to the ways of nature to live a full life.

Wizard:

The wizard strives to be a master of magical energies, shaping them and casting them as spells. To do so, he studies strange tongues and obscure facts and devotes much of his time to magical research. A wizard must rely on knowledge and wit to survive. Wizards are rarely seen adventuring without a retinue of fighters and men-at-arms. Because there are different types (or schools) of magic, there are different types of wizards. The mage studies all types of magic and learns a wide variety of spells. His broad range makes him well suited to the demands of adventuring. The illusionist is an example of how a wizard can specialize in a particular school of magic, illusion in this case.

Priest:

A priest sees to the spiritual needs of a community or location. Two types of priests--clerics and druids--are described in the Player's Handbook. Other types can be created by the DM to suit specific campaigns.

The cleric is a generic priest (of any mythos) who tends to the needs of a community. He is both protector and healer. He is not purely defensive, however. When evil threatens, the cleric is well-suited to seek it out on its own ground and destroy it.

The druid class is optional; it is an example of how the priest can be adapted to a certain type of setting. The druid serves the cause of nature and neutrality; the wilderness is his community. He uses his special powers to protect it and to preserve balance in the world.

Rogue:

The rogue can be found throughout the world, wherever people gather and money changes hands. While many rogues are motivated only by a desire to amass fortune in the easiest way possible, some rogues have noble aims; they use their skills to correct injustice, spread good will, or contribute to the success of an adventuring group. There are two types of rogues: thieves and bards.

To accomplish his goals, for good or evil, the thief is a skilled pilferer. Cunning, nimbleness, and stealth are his hallmarks. Whether he turns his talent against innocent passers-by and wealthy merchants or oppressors and monsters is a choice for the thief to make.

The bard is also a rogue, but he is very different from the thief. His strength is his pleasant and charming personality. With it and his wits he makes his way through the world. A bard is a talented musician and a walking storehouse of gossip, tall tales, and lore. He learns a little bit about everything that crosses his path; he is a jack-of-all-trades but master of none. While many bards are scoundrels, their stories and songs are welcome almost everywhere.