Treasury bills are short-term government securities issued in maturities of 91-days, 182-days, and 364-days. They are promissory notes issued by the government and sold by the central bank on behalf of the government. Treasury bills are sold via a competitive bidding process, with the lowest bidders receiving the allotment. They offer extreme security and liquidity as government-backed short-term investments, making them a preferred investment for commercial banks to park their short-term funds. Treasury bills trade at a discount to their face value.