Artificial Intelligence (AI) is the field of computer science that focuses on creating systems capable of performing tasks that typically require human intelligence. These tasks include reasoning, learning, problem-solving, understanding natural language, recognizing patterns, and making decisions.

AI can be divided into several subfields:

1. Machine Learning: Systems learn from data to make predictions or decisions.
2. Natural Language Processing (NLP): Enables machines to understand and interact using human language.
3. Computer Vision: Allows machines to interpret and understand visual information from the world.
4. Robotics: Involves designing robots that can perform tasks autonomously.

AI systems can be narrow (designed for specific tasks, like virtual assistants) or general (capable of performing a wide range of tasks, though this is still largely theoretical).

AI has applications across various domains, including healthcare, finance, transportation, and entertainment, transforming industries by automating processes and enhancing decision-making capabilities.