This book provides an accessible introduction to metadiscourse, discussing its role and importance in written communication. It explores examples from a wide range of texts from business, journalism, academia and student writing to present a new theory of metadiscourse. The final section of the book explores the importance of metadiscourse for teachers and students, and details its practical advantages and applications in the writing class. Accessibly written and packed with examples, Metadiscourse is an essential introduction for students of applied linguistics, language teachers and academics.