General term for single use consumable items like Fire Protection Potions produced by Alchemy, stamina buffing food like Tender Wolf Steak or rogue energy boosters like Thistle Tea. Generally, consumables can greatly buff a players performance, but usually the components are hard to find and expensive. Particularly Flasks can be very hard on the wallet. The more expensive consumables are normally used only in raids, but there they are sometimes chain-quaffed. Players not properly buffing themselves in raids are usually frowned upon, sometimes even kicked.
Consumables also includes certain conjured items that can be used as food or drink. For example, food and water conjured by Mages. These consumables are free, as long as you find a cooperative mage.