The gasoline-electric hybrid car is just that -- a cross between a gasoline-powered car and an electric car.  The gasoline-electric hybrid is the most commonly available hybrid at this time.  In addition to far lower gas costs, you might qualify for a federal tax deduction if you purchase a hybrid vehicle.  Three hybrid cars are now available in the United States -- the Honda Civic Hybrid, the Honda Insight and the Toyota Prius. A discussion of the Honda Insight and the Toyota Prius is presented on the howstuffworks website.  http://auto.howstuffworks.com/hybrid-car.htm