AI, or artificial intelligence, refers to the development of computer systems that can perform tasks that would typically require human intelligence, such as recognizing speech, making decisions, understanding natural language, and learning. AI can be divided into two main categories: narrow or weak AI, which is designed to perform specific tasks, and general or strong AI, which is designed to perform any intellectual task that a human can do. AI has numerous applications in fields such as healthcare, finance, transportation, and entertainment, among others.