BANKING: An Introduction to Banking

Banking is an industry that deals with credit, cash holding, investments, and other types of financial operations. Because it allocates cash to borrowers with productive investments, the banking industry is one of the most important drivers of most economies.

Deposits and withdrawals, currency exchange, forex trading, and wealth management are all services provided by banks. They also serve as a conduit between depositors and borrowers, using the monies placed by their customers to provide credit to those who need it.

Banks make money by charging interest on loans, which they benefit from by charging a greater interest rate than they pay on customer deposits. They must, however, follow the rules set down by the central bank or the national government.

A bank is a financial institution that accepts deposits from customers and provides loans to individuals and businesses.
Banks profit by charging greater interest rates on loans than they do on customer deposits.
In the United States, banks are mandated to hold 10% of client deposits as reserves, while the remaining 90% is used to make loans.
How the Banking Industry Works - Banking Fundamentals

The Federal Reserve regulates banks in the United States. Banks must keep at least 10% of each deposit on hand, but they can lend out the remaining 90% as loans. The reserve requirement applies to all types of banks with a US banking licence, and the reserve can be held as a deposit in a local Fed bank or as cash in the vault.