The types of robots used on Earth include Cartesian robots, cylindrical, spherical/polar robots, articulated robots and parallel robots. Each robot has a different function, but, typically, they perform the tasks that are too dangerous or boring for people.
Outside of industrial work, which is where robots are largely used, robots perform hazardous jobs, such as maintenance jobs and fighting fires. Some robots are even used to investigate dangerous or hazardous environments. Still other robots get launched into space. A remotely operated vehicle can either be an unmanned spacecraft or a lander that makes contact with the environment. The most common type of robot in existence is the robot arm, most often seen in industry and manufacturing.