Does low credit score give you low or high interest rate?

A low credit score bars you from getting lower interest rates. Lower interest rates mean your monthly payment is less for a given amount of money. Your credit score is supposed to be an indicator of risk (likelihood that you'll actually pay the loan back), so if you have a low credit score (less likely to pay the money back), the bank charges you more so they get more money if you suddenly stop making your payments for whatever reason. Being charged more for being "risky" may not make sense to an individual, but banks place bets on this "riskiness" across thousands - if not tens or hundreds of thousands - of individuals so by making sure they get more money upfront from those more likely to miss their payments, they systematically lessen their losses on those bets.