Arobotis an automatic mechanical device often resembling a human or animal.Modern robots are usually anelectro-mechanical machineguided by acomputer programorelectronic circuitry.Robots have replaced humansin the assistance of performing repetitive and dangerous tasks that humans are unable to do.More than a million industrial robots are now in use, nearly half of them are in Japan.Robots are blamed for rising unemployment as they replace workers in increasing numbers of functions.According to theEncyclopedia Britannica, a robot is "any automatically operated machine that replaces human effort, though it may not resemble human beings in appearance or perform functions in a humanlike manner.Industrial robots, service robots, domestic robots, educational robots, modular robots, collaborative robots, military robots are the various kinds of robots.