Knowledge extension loan is a form of credit activity in which banks or other financial institutions lend monetary funds at a certain interest rate and must return them. Loans in a broad sense refer to loans, discounts, overdrafts and other borrowing funds.

Banks put concentrated money and monetary funds out through loans, which can meet the needs of expanding social reproduction and promoting economic development. At the same time, banks can also obtain loan interest income and increase their own accumulation. This is my understanding, please accept my answer.