This document discusses different types of debt securities that provide regular cash flows to investors. It describes government securities, certificates of deposit, treasury bills, zero coupon bonds, and floating rate bonds. Government securities are issued by the government of India with a promise of repayment on maturity. Certificates of deposit and treasury bills are short-term debt instruments. Zero coupon bonds are issued at a discount to the face value and do not pay coupons. Floating rate bonds have coupon rates that are reset periodically based on a benchmark rate.