Conveyors can be used to transport items, entities and fluids. They can interact with the world using upgrades. Items and entities can go up and down on the conveyors but fluids can only go horizontal.
Conveyors can be colored by right-clicking them with a dye.
Using glowstone can make the conveyors move items and entities very fast.
Using plastic will prevent items from being picked up when they are on top of a conveyor.