A Money Market Fund is a type of mutual fund that invests in short-term, high-quality debt instruments, such as treasury bills and commercial paper. These funds aim to provide investors with a safe place to park their cash while earning a modest return, typically higher than a regular savings account. Money market funds are known for their liquidity, allowing investors to access their money quickly. They are often used by individuals and institutions as a way to manage cash reserves or as a temporary holding place for funds before making other investments.