Critical Data Studies has come of age as a vibrant, interdisciplinary field of study. Taking data as its primary analytical focus, the field theorises the nature of data; examines how data are produced, managed, governed and shared; investigates how they are used to make sense of the world and to perform practical action; and explores whose agenda data-driven systems serve. This book is the first comprehensive A-Z guide to the concepts and methods of Critical Data Studies, providing succinct definitions and descriptions of over 400 key terms, along with suggested further reading. The book enables readers to quickly navigate and improve their comprehension of the field, while also acting as a guide for discovering ideas and methods that will be of value in their own studies. Critical Data Studies is essential reading for students and scholars from across the sciences, social sciences and humanities, as well as those who work with data professionally who want to extend and enrich their conceptual and practical understanding of data and their use.