Imagine software that doesn't just answer questions but actually does things for you — book flights, write code, manage your calendar, or research complex topics. These are AI agents: autonomous programs powered by large language models that can plan, use tools, and remember context. This book strips away the hype to give you a clear, non-technical understanding of how they work, what they can and cannot do, and how to use them responsibly. You will learn the key components — from memory and reasoning to tool use and safety guardrails — through plain explanations and practical examples. Whether you are a curious professional, a business leader, or someone who simply wants to stay informed, this guide will help you separate reality from fiction and prepare for a world where AI agents become everyday collaborators. No coding required. Part of The Practical AI Library.