What Is The Difference Between Voluntary And Involuntary Muscle Of The Human Body?

A voluntary muscle is a muscle that we consciously control.
 
An involantary muscle is one that we do not control; such as the heart.

A Voluntary Muscle is a muscle you can control.
Ex) Smiling
An Involuntary Muscle is a muscle that's is not under your control.
Ex) Breathing

Voluntary and involuntary muscles depend on which parts of the brain they are activated by. Muscles that are controlled by voluntary parts of the brain are muscles that we can counciously control. Involuntary muscles are muscles that are activated by parts of the brain that we have no councsious control over, and are activated independently of our own thoughts.