T-Bills, or Treasury Bills, are short-term government securities issued by the U.S. Department of the Treasury. They are sold at a discount to their face value and mature in one year or less. Investors receive the full face value upon maturity, making T-Bills a low-risk investment option. T-Bills are often used by individuals and institutions to preserve capital and earn a modest return. They are considered one of the safest investments because they are backed by the full faith and credit of the U.S. government. This makes them a popular choice for conservative investors seeking stability.