There are a few different types of current account available that reward the account holder with cash back in various ways.
Some will pay you cash back at a percentage of money you spend on the associated debit card.
Some will do the same but with bill payments or direct debits.
Others will pay a small lump sum when you switch, and then will continue to pay out a small amount either monthly or annually based on how much money you keep in the account at any one time.
Generally though, cash back accounts will pay out very little interest, if any at all, so you should make sure, if you want one, that you’ll be able to advantage fully from any cash back scheme in place more than you would from a simple high interest rate on a more conventional account.