Banks are places where people can keep their money. Most people use banks to save money in their savings accounts and to pay money from their checking accounts. Today, when a person earns money from their job, their pay check is often electronically deposited (put) into their savings or checking account. Then, he or she can pay their bills by writing checks from their checking accounts or pay online where their bills are electronically connected to their bank accounts.
Banks also give loans to people. Banks use the money that their customers deposit to lend to people to buy new houses, cars, or to start businesses among other reasons. The bank makes money from lending by charging interest. In other words, people have to pay back more than they borrowed. This amount depends on how risky the bank thinks the borrower is and how fast the loan is paid back among other things.