Why does a bank pay a lower interest on savings accounts and checking accounts?

Banks make money by lending loans out of the money we deposit with them. In case of a regular savings account, you can withdraw your money anytime you want. So the bank cannot effectively use this money to make profits themselves. Hence the rate of interest paid on these accounts is very low. But, in case of a Certificate of Deposit the bank knows that you will not withdraw the money until the stipulated deposit period, so they can effectively utilize this money to make a profit and therefore share a percentage of the same by means of a higher interest rate.