Farming
From WoWWiki
Farming is doing nothing but killing a certain type of monster for the express purpose of getting them to drop certain items. "I farmed the Murlocs on the coast for Slimy Murloc Scales for an hour last night." Its common for tailors to kill lots of cloth-dropping humanoids to get cloth, or for leatherworkers to farm beasts for leather. Players may also repeatedly kill certain elite mobs in instances known to drop good items.
Many quests involve farming. For example, killing Kobolds in order to get their candles.
Building reputation with certain factions also involves farming certain mobs. Timbermaw Hold, Argent Dawn and Cenarion Circle are good examples.
