Fund, in a broad sense, refers to a certain number of funds established for a certain purpose. It mainly includes trust and investment funds, provident funds, insurance funds, retirement funds and funds of various foundations.
According to different organizational forms, it can be divided into corporate funds and contractual funds. Fund companies set up investment fund companies by issuing fund shares, usually called fund companies; Fund contracts are concluded by fund managers, fund custodians and investors, and are usually called contractual funds. China's securities investment funds belong to contractual funds.