A treasury security refers to a financial instrument issued by the government of a country, typically the United States, to raise funds. These securities are considered low-risk investments because they are backed by the full faith and credit of the government. There are several types of treasury securities, including Treasury bills (T-bills), Treasury notes (T-notes), and Treasury bonds (T-bonds), each with varying maturities ranging from a few days to several years. Investors purchase treasury securities as a means of preserving capital and generating income. They are often used as a benchmark for other interest rates in the market due to their perceived safety and stability. Additionally, treasury securities are highly liquid, meaning they can be easily bought or sold in the financial markets.