From investopedia:
- U.S. savings bonds, T-bills, and T-notes are all forms of debt issued by the federal government to help finance its operations.
- Bonds typically mature in 20-30 years and offer investors the highest interest payments to maturity.
- T-notes mature anywhere between two and 10 years, with bi-annual interest payments, while T-bills have the shortest maturity terms—from four weeks to a year.
- These all can be bought and sold in the secondary market, except for savings bonds, which are registered to just a single owner.