Villagers have a chance to have a Fetch Quest. A simple and small task which can be repeated three times before the Villagers turns back to normal. A player simply has to give the Villager with the Fetch Quest the required amount of the item it is asking for to get a small reward ranging from Emeralds up to an Enchanted Book.
Any spawned or bred Villager has a chance to have a Fetch Quest except the Villager located at the top of a Villager Outpost.