Are banks offering services to the general public and corporations. These services commonly include taking deposits, offering checking account services, providing business, personal and mortgage loans, offering basic financial products.
Commercial Banks work by taking up deposits and retaining a certain margin of them on their accounts. The remaining money they are lending out to the public with an interest rate which matures and becomes due to Commercial Banks. Commercial Banks are earning most of their revenue from the accumulated interest payments which they are handing out to the Customers.