Monsters, Inc. is an energy company that was founded in 1810 as Amalgamated Monsters Ltd. before taking on its current name in 1895. Its main duty is to provide all citizens in Monstropolis with energy in the form of captured screams collected from children. They accomplish this by crossing into the human world through door technology, portals connected to closets of children's bedrooms, and scaring them to the best of their ability. The screams are then collected in special canisters for use as energy.