Redstone dust is a material in the game Minecraft that is used to create various electrical circuits and mechanisms. It can be placed on the ground and connects to other redstone components, allowing players to transmit power over distances. When powered, redstone dust can activate devices like doors, pistons, and lights. Players can use it to build complex contraptions, such as traps or automated farms, by combining it with other items like levers and buttons. Its versatility makes it a key element in many creative builds within the game.