Money market fund (MMF) is a kind of financial asset similar to bank deposit. Its investment targets are short-term bonds and monetary instruments with high liquidity and low risk, such as treasury bills, commercial bills, bank acceptance bills and time deposit certificates. MMF is usually created and managed by well-funded financial institutions, and their investment portfolios will be carefully evaluated and risk controlled to ensure their investment safety and stable returns.

MMF is very popular with investors because of its high liquidity and low risk. Because of its high asset quality and liquidity predictability, and usually without management fees and sales fees, MMF's risk is lower than other fixed-income investment products, such as bond funds or index funds, but its yield will be affected accordingly. Of course, due to various reasons, such as financial market volatility and economic uncertainty, the net value of MMF may fall, but this rarely happens.

Generally speaking, money market fund is a safer and more stable investment choice. It is a good choice for investors who pursue liquidity, short investment cycle and stable income. Of course, considering everyone's different risk preferences and investment needs, investors need to carefully compare various indicators and costs when choosing investment products and make careful decisions.