The question of power runs like a red thread through the work of Michel Foucault and has also sparked highly controversial discussions that are by no means concluded - on the contrary: Foucault's concepts, such as biopower, governmentality, as well as the aesthetics of existence and disciplinary power, provide crucial impulses for current debates in philosophy and sociology, as well as in political and historical science. This volume gathers the most important texts of Foucault, thus offering a comprehensive overview of one of the central areas of theoretical development in recent decades. In his afterword, Thomas Lemke elucidates both the historical and systematic context of Foucault's theory of power.