Digital history is an emerging field that draws on digital technology and computational methods. A global enterprise that invites scholars worldwide to join forces, it presents exciting and novel ways we might explore, understand and represent the past. Hannu Salmi provides the most compelling introduction to digital history to date. Beginning with an examination of the origins of the digital study of history, he goes on to discuss the question of how history exists in a digitized form. He introduces basic concepts and ideas in digital history, including databases and archives, interdisciplinarity and public engagement. Outlining the problems and methods in the study of big data, both textual and visual, particular attention is paid to the born-digital era: the contemporary age that exists primarily in digital form. _What is Digital History?_ is essential reading for students of history and other humanities fields, as well as anyone interested in how digitization and digital cultures are transforming the study of history.