Venture Capitalists (VCs)
Venture capitalists tend to be more hands on and infuse more money at various stages. They are more ruthless than angel investors and are generally not people you know but people that either seek you out or that you seek out. A lot of times the funds are not their own to invest. They are companies pretty much. (Better definition)
Think of angel investors as angels that come to the rescue and are more friendly and think of VCs as sharks who come to feast and are not super friendly.
They do not want to take on small projects as it is too much work for too little payoff. They want a huge payoff. Do not expect them to fund your little store or your kiosk at the mall. Look at this article about VCs vs Angel Investors.
Videos about VCs
Some Places to Find Them