Friends and family are persons who have a pre-existing connection to a company's founding team, but do not spend much time investing in private companies and have limited-to-no experience with such investments.
Angel Investors are generally high-net-worth individuals who invest their own money in early-stage startups.
Venture Capitalists make a living by investing in early-stage, high-growth companies. Venture Capitalists invest the money of a venture capital fund, which is often financed by a mix of their own money and the money of other limited partners.