Artificial Intelligence (AI) refers to computer systems that think and act like humans, and think and act rationally. AI is rapidly transforming our world with innovations like autonomous vehicles driving our city streets, personal digital assistants in our homes and pockets, and direct human brain interfaces that can help a paralyzed person feel again when using a brain-controlled robotic arm.In recent years, the field of AI has experienced a remarkable surge in capabilities. AI-enabled systems are beginning to revolutionize fields such as commerce, healthcare, transportation and cybersecurity. It has the potential to impact nearly all aspects of our society including our economy, yet its development and use come with serious technical and ethical challenges and risks. AI must be developed in a trustworthy manner to ensure reliability and safety.