With digitization and automation processes pervading virtually all aspects and domains of society, the routine registration of personal identifiable data is increasing at an exponential rate. This book, combining recent insights gained from several disciplines-including science and technology studies, surveillance studies, philosophy (social philosophy and philosophy of technology, and computer ethics)-with a range of empirical case studies of topics including law enforcement and policing, marketing, migration, youth care, and security, examines the ways digital technologies of identification are implicated in contemporary transformations of identity in all spheres of life.