The Federal Money Market is a market where short-term, low-risk debt securities are traded between financial institutions. 

These securities are issued by the US government, including the Federal Reserve, and are considered to be among the safest investments available.

The purpose of the Federal Money Market is to provide a source of funding for banks and other financial institutions.  

These institutions use the money they borrow in the Federal Money Market to finance their daily operations, such as making loans to consumers and businesses. 

The Federal Money Market is also used by the Federal Reserve to implement monetary policy by adjusting interest rates.

Investors can participate in the Federal Money Market by investing in money market funds.  

These funds invest in short-term debt securities issued by the US government, such as Treasury bills and commercial paper.  

Money market funds are considered to be low-risk investments because they invest in high-quality, short-term securities that are backed by the full faith and credit of the US government.