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 components, allowing players to transmit power and signals. When powered, it can activate devices like doors, pistons, and lights. Players can obtain redstone dust by mining redstone ore, which is found deep underground. It can be crafted into different items, such as redstone torches and repeaters, enhancing its functionality in complex builds. Redstone dust is essential for creating automated systems and intricate contraptions in the game.