An autopilot is a flight control system that allows a pilot to fly an airplane without continuous hands-on control of the airplane. It allows the pilot to focus on higher-order tasks such as navigating, communicating with air traffic control, planning for weather contingencies and rerouting associated with any kind of emergency circumstance.
Video games are used in about five different ways.
3-D printing refers to a kind of manufacturing where a part is built up layer by layer. With a typical machine, you take a block of material and subtract away. With additive manufacturing, or 3-D printing, you start with nothing and you add layer by layer until you have a final part.