Investment fund is a collective investment system with both benefits and risks. Investment funds concentrate investors' funds and are managed by professional managers entrusted by fund custodians, specializing in investment activities. People usually refer to funds mainly as securities investment funds. The company that manages investment funds is a fund management company. Fund management companies manage many funds. Fund management companies do not engage in specific investment business, but are only responsible for managing their funds.

Investment fund companies are directly engaged in investment business, there are various types, such as equity investment fund companies.