This document discusses various types of short-term securities, including treasury bills, commercial papers, marketable securities, and short-term government bonds. Treasury bills are issued by the US Department of Treasury and provide returns through discounted prices. Commercial papers are used by large companies to fund short-term obligations like payroll. Marketable securities can be easily converted to cash due to short maturities and liquid trading rates. Short-term government bonds are issued domestically to fund government projects and carry political, interest rate, and inflation risks for investors. In conclusion, short-term securities provide liquidity in the market through maturities of less than one year.