Artificial Intelligence (AI) refers to the simulation of human intelligence in machines programmed to think, learn, and solve problems like humans. It's an umbrella term encompassing various sub-fields: Machine Learning (ML) is a subset of AI enabling systems to learn from data without explicit programming; Deep Learning (DL) is a subset of ML using neural networks with multiple layers to process complex patterns; and Generative AI (GenAI) is a type of AI, often using DL, capable of creating new content like text, images, or code.