A loom is a device used to weave fabric. In Terraria, a loom can be crafted using wood and iron bars. It is used to create a variety of items, including cloth, banners, and tapestries.
Looms are an important part of Terraria, as they allow players to create a variety of items that can be used to improve their homes, decorate their worlds, and even create new weapons and armor. Additionally, looms can be used to create items that can be sold to other players for profit.