A remote weapon system is like a robot that can control a big gun or a missile. Instead of a person sitting right next to the gun, they can be far away, like in another room or even another country. They use a special computer system to control the gun and aim it at a target. This is helpful because it can keep people safe from danger while still being able to fight if they need to. So, it's like playing a very high-tech video game, but instead of a controller, they use a computer to control a big gun or missile.