What is a Bank?
According to Wikipedia, a bank is a financial institution that acts as a payment agent for customers, and borrows and lends money.
Banks serve as payment agents by collecting money from clients through current accounts, paying and collecting checks and via other payment methods such as telegraphic transfer and ATM.
Banks borrow money by accepting funds, deposits and by issuing debt securities such as bonds and banknotes. On the other hand, they lend money from current accounts of clients, by making installment loans, by investing in debt securities and many other forms of lending.