What is the difference between a certification and a license?

Another contrast with licensure is that, under a licensing law, practitioners of the licensed occupation must have a license in order to practice. It is involuntary. On the other hand, certification is voluntary. One does not have to be certified in order to practice.

Your license is a order to practice, thats how its different.

when in a crucial situation, after calling 911, the correct posture for delivering effective compression is the proper hand placement.

first, place two fingers at the sternum, then put the heel of your other hand next to the fingers and place hand on top of the other. lock your elbows by using your body’s weight and compress the victim’s chest with a depth of 2 inches.

moreover, do 15 compression and 2 breaths, this process must be done four times until there is a pulse or a arrive.