1, they are not the same concept. Investment bank is a kind of financial institution corresponding to commercial bank. Is a non-bank financial institution mainly engaged in securities issuance, underwriting, trading, enterprise restructuring, mergers and acquisitions, investment analysis, venture capital, project financing and other businesses. It is the main financial intermediary in the capital market.

2. Hedge funds refer to financial funds whose purpose is to make profits after financial derivatives such as financial futures and financial options are combined with financial instruments. It is a form of investment fund, which means "the risk is hedge fund's".

3. Private equity investment mainly refers to the private equity investment part of mature enterprises that have formed a certain scale and generated stable cash flow, mainly refers to the private equity investment part in the later stage of venture capital, in which M&A funds and mezzanine capital account for the largest proportion in the capital scale. Private equity investment in a broad sense refers to the equity investment covering all stages before the initial public offering of enterprises, that is, the investment in enterprises in the seed period, initial stage, development period, expansion period, maturity period and Pre-IPO period. According to the investment stage, relevant capital can be divided into venture capital, development capital, M&A fund, mezzanine capital, revitalization capital, pre-listing capital and others, such as post-listing private equity investment, bad debts and real estate investment.