Explain the following term/concept.
Treasury Bills are short-term securities issued by RBI to meet the government's short-term funds requirement. These bills are negotiable and freely transferable. They are sold to banks, individuals, firms, institutions, etc. The minimum value of T-bills is 25,000 or in multiples of 25000. These bills are also called Zero-Coupon Bonds. T-bills have three maturity periods - 91 days, 182 days, and 364 days.