What is the difference between a private equity and investment banker?

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Private Equity - Business Buyer on behalf of investors (Looks for potential opportunity to invest pooled funds)

Investment Banker - Investment Seller on behalf of businesses (Looks for potential investors for existing businesses) 

The fundamental difference between an investment fund and an investment company is the openness of its capital. That is, in an investment fund, any investor can enter or leave the fund at any time in the framework of the statute; however, in an investment company, the entry and exit of capital is merely in the form of an increase or decrease in capital and During the procedures stipulated in the Commercial Code. Since the entry and exit of the investor and investor in an investment fund is an authorized and defined transaction, there is no need to transfer investment units, but in the investment companies, if the investor intends to withdraw from the company, You must transfer your investment unit to someone else, or if you want to increase your share in the company, you must purchase the shares you want from other shareholders.