When ATMs were introduced, they removed the time constraint of customers being able to withdraw cash from their account only when the bank branch was open. Since their introduction, further functionality has been added (account balances, mini
statements, bill payment etc.). These are all aspects of utility, but they are of course useless unless ATMs are sited in convenient locations, are kept topped up with cash and printer paper, have secure access controls and are reliable.
Internet banking offered new utility through additional functions (e.g. transfers and online account creation) as well as allowing the customer to do all these anytime, anywhere. Different security, capacity and availability aspects are required in order to ensure the functionality is provided.