What is a machine?
A mechanism is a combination of a number of bodies assembled in such a way that the motion of one causes constrained and predictable motion to the others. The purpose of mechanism is to transform motion into some desirable pattern.
A machine typically contains mechanisms which are designed to provide significant forces and transmit significant power. Some examples of machines are a food blender, an automobile transmission, a bulldozer, a robot, and an amusement park ride.
A machine not only imparts definite motions but also transmits and modifies the available mechanical energy into some kind of desired work.