Discipline PVE Build and Glyphs - Priest

(Wrath of the Lich King)

The discipline tree focuses on damage mitigation and strengthening the priest's buffs such as Power Word: Fortitude and Inner Fire. Discipline priests have Penance, which is one of the most efficient single target heal spells in the game. 

The tree is generally concentrated to keeping a Tank alive, while supporting the raid with damage mitigation through the highly improved Power Word: Shield and fast dispels. Disc priests also have a collection of "panic" buttons with short cooldowns that can be used to prevent a raid member (mainly the tank) from dying to an unavoidable circumstance. 

Discipline is also the preferred spec for PvP; with the shortage of mana regen and intellect on PvP gear the efficiency of the discipline tree, and the ability to keep yourself alive through an onslaught, really shines.

Source: http://www.wowwiki.com/Priest