Book excerpt: The Routledge Companion to Freedom of Expression and Censorship offers a thorough exploration of the debates surrounding this contentious topic, considering the importance placed upon it in democratic societies and the reasons frequently proposed for limiting and constraining it. This volume addresses the various historical, philosophical, political and cultural parameters of censorship and freedom of expression as well as current debates involving technology, journalism and media regulation. Geographically, temporally and culturally diverse accounts of censorship and freedom of expression are discussed through a broad range of perspectives and case studies. This Companion covers core principles and concerns in addition to more specialist and controversial debates, including those surrounding hate speech, holocaust denial, pornography and so-called ‘cancel culture’. The collection pays particular attention to the role of the media in both facilitating and suppressing freedom of expression. Comprehensive, original and timely, The Routledge Companion to Freedom of Expression and Censorship is a go-to resource for scholars and advanced students of media, communication and journalism studies.