This book addresses the issue of one of the most visible and debated currents in contemporary radical Islam. It sheds light on the history, the fundamental principles, and the political and religious translations of Salafism and explains current events involving Salafist actors in an objective and dispassionate manner. The author explains with precision the different contemporary Salafist mobilizations by illustrating them with specific cases while shedding light on the main debates related to this mode of understanding of the Muslim religion, such as its potential role in triggering certain forms of violence, the way to compare it to other fundamentalist versions in other religions, or the way to describe, in terms of social sciences, the main concepts and discourses that can be observed in this current of Islam today.