An armor stand is a block entity added in Java Edition 1.8 and Bedrock Edition 1.0.0 that can hold and display a set of armor. It can be customized with different poses and positions, making it a useful tool for map makers, builders, and players who want to showcase their armor sets.
Armor stands are popular because they allow players to display their armor in a variety of ways. Players can position them in different poses, making them a great tool for creating dioramas or showcasing a specific set of armor. Armor stands can also help players to see how different armor pieces look together, making them a great tool for planning an outfit.