Treasury bills or T-bills, which are money market instruments, are short term debt instruments issued by the Government of India and are presently issued in three tenors, namely, 91 day, 182 day and 364 day. Treasury bills are zero coupon securities and pay no interest. They are issued at a discount and redeemed at the face value at maturity. government security is a tradable instrument issued by the central government or the state governments. It acknowledges the government's debt obligation. Such securities are short term (usually called treasury bills, with original maturities of less than one year) or long term (usually called government bonds or dated securities with original maturity of one year or more). In India, the central government issues both, treasury bills and bonds or dated securities while the state governments issue only bonds or dated securities, which are called the state development loans (SDLs).This book discusses about treasury bills working process and itaoverview related to Auction process and its interest rates.