What is a robot?

An automatic apparatus or device that performs functions ordinarily ascribed to humans or operates with what appears to be almost human intelligence.
or,
A robot is a reprogrammable multifunctional manipulator designed to move material,
parts, tools or specialized devices through variable programmed motions for the
performance of a variety of tasks.

.Anatomy of a robot

The basic components of a robot system are:
• the mechanical linkage
• actuators and transmissions
• sensors• controllers
• user interface
• power conversion unit