"White mages use curing magicks to mend allies' wounds and restore them to health."
The White Mage is a Job appearing in Final Fantasy Tactics A3. The Job is a master of curative magic. The Job is available to Humes, Nu Mou, and Viera right from the beginning. White Mages are quite useful with abilities such as Cure, that heals your party members and damages undead, and Raise, that revives a KOed unit or damages undead. A drawback of these healers is their low HP, so a good way to combat this is to acquire their skills while alternating with another Job, such as Beastmaster, although that would lower the Magic stat. A better idea would be using the White Magic skillset as a secondary A-Ability and changing your Job class with another since the White Mage's Magic growth is average so you may wish to change Jobs to one better suited for growth in that area.
The White Mage's reviving spells Raise and Arise, may be used to move a KOed unit to a tile that is otherwise unreachable. This is useful for example in maps where treasure is on a ledge and no units have a sufficient Jump stat to reach it. Refresh is also one of the few ways of getting rid of Doom and some status reducing effects.
The White Mage's Turbo MP ability is less useful than in the first game, because now all units start with zero MP. Without any external source of MP restoration, Turbo MP effectively doubles the amount of time a unit has to wait before they can cast their spells, unless you use an Ether or use the Cannoneer's Ether Shot ability.