The core professions were introduced with Guild Wars Prophecies. Each campaign after Prophecies also includes these professions (and two new professions per campaign). The core professions include: Elementalist, Mesmer, Monk, Necromancer, Ranger, and Warrior.
Elementalist – this profession is a caster damage dealer through use of magic. They use a high amount of Energy, and are able to use magic skills in Energy Storage, Fire, Earth, Air, and Water.
Mesmer – this profession is a caster that is a master of illusion and misdirection. They use skills related to Fast Casting, Domination, Illusion, and Inspiration.
Monk – this profession is used as a healer. They use skills for Divine Favor, Healing, Protection, and Smiting.
Necromancer – this profession is used as a caster that is able to deal high damage in curses and blood magic, or even raise minions from dead foes or allies. They use skills in Soul Reaping, Curses, Blood, and Curses.
Ranger – this profession is used as a ranged damage dealer. They are able to charm a pet as a companion, set traps, and attune with nature. They use skills in Expertise, Beast Mastery, Marksmanship, and Wilderness Survival.
Warrior – this profession is used primarily as a tank. They use skills in Strength, Axe, Hammer, Swordsmanship, and Tactics.
Characters are able to also choose a secondary profession (through quests) to make their character unique and adjust to any situation they encounter in game.