Chain command blocks in Minecraft are one of three different command block types that can be utilized in-game.

Difference between impulse, chain, and repeating command blocks in Minecraft Impulse command block Impulse command block can execute a command once when they are activated (Image via Mojang Studios) ...

Mysticat To get a perfect circle, Mysticat creates a repeating command block that’s always active. They also add a chain command block as well. Together these codes tell the armor stands how to ...