A "Venture Capitalist" is a person who invests in a business venture, providing capital for start-up or expansion.
"Venture Capitalists" are looking for a higher rate of return than would be given by more traditional investments.
A "venture capitalist" can be a "professional investor", or "Market Maker".
The "venture capitalist" may have no business experience applicable to the industry your company is involved in, and is focused on "the potential rate of return" your company can provide.