Emerald is a type of currency in Minecraft that you can use to trade with professional villagers. There are multiple types selling and buying different items.

The automatic wool farm is a ... This farm is quite compact, making use of villagers, zombies, and iron golems (which you can also farm using our Minecraft iron golem farm guide), making it ...

From food to blocks to resources, most things in Minecraft can ... a garbage food source, the villagers seem to value them.