Whats a Treasury bill?
Treasury bills are short-term debt instruments issued by the U.S. Department of the Treasury on a weekly basis to finance the operation of the federal government. They are part of the series of marketable securities issued by the government including “bills” (<1 yr), "notes" (1yr-10 yr), and "bonds" (> 10yr). They are also part of what comprises the “money market” for short-term debt instruments.