Today, robots are used in factories all over the world because robots are more efficient and accurate than humans. Robots can work long hours without pay and food, need no sleep or rest, cannot shake or shake like human hands, and can do jobs that humans are not available to. But also because of that, they become dangerous. They easily replace humans. In the future, there may be an incident that causes robots to betray humans, and then replace them. It is really dangerous. Although robots are useful, their threat to humans is so high, we should not put too much faith in robots.