This book is an introduction to the key concepts of the social philosopher and social theorist Michel Foucault. The text is written with clear examples to illustrate the relevance of Foucault's analysis of modern society. In particular, the book explores concepts of power, subjectivity and body. It highlights how Foucaults methods to investigate social issues of society such as mental illness and crime are derived from archaeology and genealogical analysis and also explores the strengths and limitations of Foucault's approach to social theory.