A robot is a mechanical or virtual artificial agent, usually
an electro-mechanical machine that is guided by a computer program or
electronic circuitry. Robots can be autonomous, semi-autonomous or remotely
controlled and range from humanoids such as ASIMO and TOPIO to nano robots,
'swarm' robots, and industrial robots. By mimicking a lifelike appearance or
automating movements, a robot may convey a sense of intelligence or thought of
its own. The branch of technology that deals with robots is called robotics.
Machinery was initially used for repetitive functions, such
as lifting water and grinding grain. With technological advances more complex
machines were developed, such as those invented by Hero of Alexandria in the
1st century AD, and the automata of Al-Jazari in the 12th century AD. The
robots made by such inventors were more for the purpose of entertainment than
for performing work.
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