A mobile robot is an automatic machine that is capable of locomotion. Mobile robotics is usually considered to be a subfield of robotics and information engineering.
A robotic vacuum cleaner
Military robots are autonomous robots or remote-controlled mobile robots designed for military applications, from transport to search & rescue and attack.
Armed Predator drone
Soviet TT-26 teletank, February 1940
British soldiers with captured German Goliath remote-controlled demolition vehicles (Battle of Normandy, 1944)
Foster-Miller TALON SWORDS units equipped with various weaponry