It’s a debt security i.e. a long term financial obligation or secured loan issued through underwriting or auctions by either the government or corporate organisations.
It is listed on the stock exchange and is therefore tradable.
Government bonds are tax-free
Treasury Bills
It is a short-term negotiable bill of exchange used by governments to help finance national borrowing requirements, quoted for purchase/sale in the secondary market on an annual percentage yield to maturity. It is also issued at discount.