Archaeological Theory: The Basics is an accessible introduction to an indispensable part of what archaeologists do. The book guides the reader to an understanding of what theory is, how it works and the range of theories used in archaeology. The growth of theory and the adoption of theories drawn from both the natural and social sciences have broadened our ability to produce trustworthy knowledge about the past. This book helps readers to see the value of archaeological theory and beyond what is sometimes thought to be just the use of indigestible jargon. Key theories and concepts are introduced to the reader. Among the main questions discussed are the following: What is theory and why do we need it? What major areas of theory are, and have been, used and debated in archaeology? What do they tell us about themes including human society, evolution, culture, identity and agency? How might archaeological theory change in the future? This book is written mainly for readers new to archaeology and will help them to understand archaeological theory. It assumes no prior knowledge of archaeological theory and presents it in a selective and clear way, with case studies showing how theory is used in practice.