About Robot

If a machine looks anthropomorphic or zoomorphic (e.g. ASIMO and Aibo), especially if it is limb-like (e.g. a simple robot arm), or has limbs, or can move around, it would be called a robot.
For example, even if the following examples used the same control architecture:
a player piano is rarely called a robot
a CNC milling machine is very occasionally called a robot.
a factory automation arm is usually called a robot, and is always called an industrial robot.
a zoomorphic mechanical toy, like Roboraptor, is usually called a robot.
a humanoid, like ASIMO, is almost always called a robot.
Interestingly, while a 3-axis CNC milling machine may have a very similar or identical control system to a robot arm, it is the arm which is almost always called a robot, while the CNC machine is usually just a machine. Having a limb can make all the difference. Having eyes too gives people a sense that a machine is aware (the eyes are the windows of the soul). However, simply being anthropomorphic is not sufficient for something to be called a robot. A robot must do something, whether it is useful work or not. So, for example, a rubber dog chew, shaped like ASIMO, would not be considered a robot.
Official definitions and classifications of robots
Countries have different definitions of what it means to be a robot.
The Robotics Institute of America (RIA) officially recognizes four classes of robot:
A: Handling devices with manual control
B: Automated handling devices with predetermined cycles
C: Programmable, servo-controlled robots with continuous of point-to-point trajectories
D: Capable of Type C specifications, and also acquires information from the environment for intelligent motion
In contrast, the Japanese Industrial Robot Association (JIRA) recognizes as many as six classes:
1: Manual - Handling Devices actuated by an operator
2: Fixed Sequence Robot
3: Variable-Sequence Robot with easily modified sequence of control
4: Playback Robot, which can record a motion for later playback
5: Numerical Control Robots with a movement program to teach it tasks manually
6: Intelligent robot: that can understand its environment and able to complete the task despite changes in the operation conditions
Such variation makes it difficult to compare numbers of robots in different countries. Japan has so many robots partly because it counts more machines as robots. For this reason, the International Standards Organization gives a single definition to be used when counting the number of robots in each country. International standard ISO 8373 defines a "robot" as:
An automatically controlled, reprogrammable, multipurpose, manipulator programmable in three or more axes, which may be either, fixed in place or mobile for use in industrial automation applications.