Take a minute to think about the sources of your motivation. What makes you do the things you do?
Do you go to work to get a paycheck, or because you genuinely enjoy your job?
Do you drive the speed limit to avoid punishment, or because you value your safety and enjoy taking the time to take a break from everyday life in the car?
These are perfect examples that show the difference between intrinsic and extrinsic motivation.
Many things can motivate you to do what you do, but the primary difference between intrinsic and extrinsic motivation is whether you are driven by an internal desire or by some external force that can be positive or negative.