Commercial banks accept deposits from customers and use those deposits to offer various loan and financial products to businesses. The key functions of commercial banks include accepting deposits, advancing loans, investment services, and transferring funds. Modern functions have expanded to include online banking services, debit/credit cards, ATMs, and electronic funds transfers. When commercial banks lend out money, they create new deposits in the economy through the process of credit creation, subject to reserve requirements and other limitations set by the central bank.