What is a lever

I got my information from mocomi.com/lever/

Some things people now levers

A lever is a simple machine because it can be used simply. A first class lever is where the pivot between the effort and the load. A second class lever is where the load is between the fulcrum and the effort. A third class lever is where the effort is between the fulcrum and the load. Some examples are your arm, wheelbarrow, wire cutters, hammer and your arm, a seesaw, scissors, nut cracker, tweezers.