In present circumstances, for Human- Computer Interaction the hand gesture technology is a more habitual and usable system. Programmed hand gesture recognition framework gives us another strategy to be interconnected with the virtual environment. Humans use genuine physical controllers like mouse, keyboard to interlink with the computer which forestalls regular interface due to solid hindrance. To perceive the hand gesture and act according to the user commands to control the application is the sole purpose of hand gestures. This paper explores late strategies utilized in vision based Human Computer Interaction. All the approaches discussed in this paper are calculated and classified based on the type of work done, applied algorithms and proofs and also resources utilized.