Fund: There are broad and narrow definitions. Broadly speaking, a fund refers to a certain amount of funds set up for a certain purpose. People usually refer to funds mainly as securities investment funds.

Stock: the ownership certificate issued by a joint-stock company, which is a kind of securities issued by a joint-stock company to each shareholder as a shareholding certificate in order to raise funds and obtain dividends and bonuses. Stocks can be transferred and traded, and are the main long-term credit instruments in the capital market, but companies cannot be required to return their capital contributions.