Artificial intelligence (AI) is machine intelligence exhibited by machines. The document discusses the history of AI from its origins in 1943 to current applications. It provides examples of how AI is used in expert systems, natural language processing, speech recognition, computer vision, robotics, and automatic programming. The future of AI could include more advanced personal robots and intelligent autonomous vehicles, but may also face challenges around developing human-level cognition in machines. The document concludes that AI has increased our understanding of intelligence while revealing its complexity, providing challenges and opportunities for future research.