Machine It is a contrivance which transforms energy available in one form or another to do the desired work.
Element It is a part of machine which has been manufactured without the operation of assembling.
Link It is a resistant body or assembly of resistant bodies, which constitute part or parts of a machine, connecting other parts which have motion relative to it.
Rigid link A link is called rigid, when it does not undergo any deformation while transmitting motion, for example a connecting rod, a crank etc.
Flexible link It is a link which while transmitting motion is partly deformed in a manner not to affect transmission of motion, for example, belts and springs.
Floating link It is not connected to the frame. ...