Artificial intelligence is a composition of abilities like learning, reasoning, perceiving, understanding language, and feeling. It is the science and engineering of making intelligent machines. Examples of AI in use include a Mars lander that can navigate and dig on the red planet, a mind-controlled prosthetic arm that can pick up paper, a surgical robotic system that can perform delicate brain surgery, and a robot named Dexter that can walk, run, and jump through the use of flexible joints and air cylinders. AI is developing technologies that are changing how people live.