What you mean by bank?

A bank is a financial institution that accepts deposits from the public and creates credit. Lending activities can be performed either directly or indirectly through capital markets. Due to their importance in the financial stability of a country, banks are highly regulated in most countries. Most nations have institutionalized a system known as fractional reserve banking under which banks hold liquid assets equal to only a portion of their current liabilities. In addition to other regulations intended to ensure liquidity, banks are generally subject to minimum capital requirements based on an international set of capital standards, known as the Basel Accords.

Definition of Bank. A financial institution that is licensed to deal with money and its substitutes by accepting time and demand deposits, making loans, and investing in securities. The bank generates profits from the difference in the interest rates charged and paid.