OMG $#%^*#@!~%^&${&, obviously you're lazy to do your own research because searching on google is way easier than register in a forum and starting a new thread. But instead of just whining here are some links for you to see. Now go educate your self.
http://www.howstuffworks.com/hybrid-car.htm
http://www.youtube.com/results?search_query=how+hybrid+engine+works&aq=0&oq=how+hybrid+engine+
http://www.youtube.com/results?search_query=how+hybrid+cars+work&aq=0&oq=how+hybrid+ca