What are simple machines and what is a fulcrum. first class lever second and third lever

A Simple Machine is the Basic Device/Part of any Major Physically Operated System, and is a Machine based on Force Input and Output. Simple Machines are 5 machines that are lone, These 5 Simple Machines are an Inclined Plane, A Screw, Wheel and Axle, Pulley, and a Wedge.
And a Fulcrum is the point the Lever rests on and/or is Basically the Base of the Lever, like a Seesaw for Example.

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