Artificial intelligence (AI) is intelligence exhibited by machines. The document traces the history of AI from its origins in 1943 to its applications today. It discusses early developments like McCullough and Pitts' artificial neurons and Turing's work. Applications discussed include expert systems, natural language processing, computer vision, and robotics. The future of AI is uncertain but it is likely to continue advancing and being applied in more areas like virtual assistants, video games, and self-driving cars. The document concludes that AI has improved understanding of intelligence while revealing new challenges to address.