Compound Interest is one of the safest way to invest your money because there's a guarantee that your money will increase its value by the percentage that you will accumulate annually by the bank that you deposited. Let say your current principal is $2000 and you hold it a year, the interest rate is 5% yearly the compound interest is 3 times annually that would be $2,101.68. That's a sure increase of money unlike investing in cryptocurrency there is no assurance that the price will still the same.