paladin is a hybrid class with the ability to play a variety of different roles — including healing (holy), tanking (protection), and DPS (retribution). They have auras, blessings and seals that provide useful buffs for other players while withstanding heavy physical damage with plate armor and strong defensive abilities. Paladins are also considered to be holy knights or blood knights.
Paladins are the virtuous defenders of the weak and tireless, unfaltering enemies of the undead. Mixing elements of the warrior and the clerics of the Holy Light, the paladin is a tough melee fighter. The tradition of the Holy Light is unique to a few of the Alliance races and the blood elves of the Horde.
The paladin is a "warrior of the Holy Light". They uphold all that is good and true in the world and revile all that is evil and sinister — especially undead and the Burning Legion. They offer succor to the beleaguered and smite their enemies with holy fervor. They are particularly potent against undead, as these creatures threaten the goodly races and the Holy Light burns them terribly. The presence of any evil is reprehensible to the paladin, but he focuses his efforts on destroying undead and demons. These warriors uphold the tenets of the Holy Light and defend the Alliance from the predations of any threat to their peoples. Found in almost every corner of Azeroth fighting the forces of evil and barbarism, these stalwart warriors of faith ceaselessly uphold their vigil against demonic forces from beyond the Dark Portal. Humans, draenei, and Ironforge dwarves are the most likely to become paladins, as these races revere the Holy Light. Blood elves known as Blood Knights bend the powers of the Light to their will, though rumor has it they have recently begun to use the Light legitimately. The paladin order, also called the Knights of the Silver Hand, grew out of humanity’s culture, and its greatest heroes and fiercest proponents are humans. Ironforge dwarves possess the toughness needed to withstand the onslaught of the paladins’ many enemies. High elves rarely become paladins, though this has changed somewhat, as their blood elf brothers and sisters expand the Blood Knight order. The Blood Knights are commonly mistaken as the enemy of the Knights of the Silver Hand by outsiders unfamiliar with the ways of the Light, but this is false presumption. Paladins are the embodiment of good and selfless dedication to the protection of their peoples. They help the innocent and punish the wicked. As such, all paladins are of good alignment.
Paladins play a key role by buffing their allies. However, they also have a few other handy spells and abilities in their arsenal.
Auras
In addition to spell buffs (see Blessings below) paladins have the ability to use auras, area-of-effect buffs that boost the abilities of all party members within a certain radius. Only one aura may be active per paladin, but multiple paladins can use different auras within a group.
Blessings
Blessings are spell buffs that can be cast on most friendly targets.
Seals
Seals are long term self-buffs which boost the paladin's power temporarily. Effectively, they add a weapon proc to their melee strikes. Additionally, paladins can unleash these seals upon an enemy with any of three Judgment abilities, causing holy damage and causing an effect depending on which judgment was used.