A bank is a financial institution that accepts deposits, offers loans, and enables transactions, serving as a cornerstone of economic systems. Historically, banks developed from medieval practices, such as those of the Knights Templar, into contemporary organizations regulated by frameworks like fractional-reserve banking and the Basel Accords.
Thinkers such as John Law emphasized banks' role in expanding the money supply, while Michel Chevalier cautioned about their widespread impact on trade. Chester Arthur Phillips examined their operational processes, and Franklin Roosevelt stressed their role in directing deposits toward economic activity. These viewpoints highlight banks' dual function as generators of liquidity and protectors of financial stability, influencing economies through managed risk and the distribution of credit.