For more than a decade, linguistics has moved increasingly away from evaluating language as an autonomous phenomenon, towards analysing it 'in use', and showing how its function within its social and interactional context plays an important role in shaping in its form. Bringing together state-of-the-art research from some of the most influential scholars in linguistics today, this Handbook presents an extensive picture of the study of language as it used 'in context' across a number of key linguistic subfields and frameworks. Organised into five thematic parts, the volume covers a range of theoretical perspectives, with each chapter surveying the latest work from areas as diverse as syntax, pragmatics, psycholinguistics, applied linguistics, conversational analysis, multimodality, and computer-mediated communication. Comprehensive, yet wide-ranging, the Handbook presents a full description of how the theory of context has revolutionised linguistics, and how its renewed study is crucial in an ever-changing world.