An AI Agent is an autonomous entity that perceives its environment and takes actions to achieve specific goals. Unlike simple programs, AI agents can operate independently, make decisions, and learn from their experiences. When combined with LLMs, they can understand complex instructions, reason about the world, and interact with software and APIs on a user's behalf. For example, an AI agent could book a trip, manage a calendar, or conduct market research, demonstrating a high level of autonomy and intelligence that goes far beyond traditional automation.