What is the difference between the shaper and planer and slotter?

A shaper is a reciprocating machine tool in which the ram moves the cutting towel backwards and forwards. A shaper is intended to produce flat surfaces. A planer is used to produce horizontal, vertical or inclined flat surfaces. A planer is used to work on heavy and large work pieces that cannot be accommodated on the table of a shaper. A slotter is also called a vertical shaper. The difference between a shaper and a slotter is the direction of the cutting action of the tools.