Compound Interest and the rule of 72

Compound Interest is basically that when that you put your money in the bank your gains interest on the money you have and after a couple of years your interest gains interest on that. When you have like a 1000 in the bank and your interest rate is 10% you will add 10% every year. I think Einstein said this because when you have compound interest rate you gain more money every year on the monry you hvae in the bank. When you have compound intrest is usually lower like 2-4% not as high as 10%