Cooks can create dishes to be consumed to heal a character. Food that heals can be purchased from NPC traders but food created by cooks has a greater healing potential so it is also has some value as a trading commodity. In addition, higher level food will grant the eater temporary attribute bonuses. The food can be fed to hunter pets also although the bonus to attributes (spirit, intellect etc) will not apply to the pet.
Alchemy
Blacksmithing
Mining
Herbalism
Leatherworking
Skinning
Engineering
Tailoring
Enchanting
Secondary Proffesions
Cooking
First Aid
Fishing