The document discusses Certificates of Deposit (CDs) and how they work. CDs are financial instruments issued by banks at higher interest rates than fixed deposits to attract funds from corporations. This allows banks to borrow money when they do not have enough funds to provide loans. For example, when a bank wants to provide a loan but only has enough funds for part of it, it can issue CDs to corporations to access more funds. It then uses these funds to provide the full loan amount to the borrower. CDs generally mature within one month to five years.