An Introduction to Sociolinguistics, now in its 5th edition, by Janet Holmes and Nick Wilson, is a leading textbook that delves into the intricate relationship between language and society. Published by Routledge on February 1, 2017, this comprehensive volume explores how language functions within diverse social contexts and how it serves as a powerful tool for conveying and understanding social identities. The book is thoughtfully structured into three sections, presenting foundational sociolinguistic concepts through both established theories and contemporary research. This edition features significant updates, including a new chapter dedicated to the latest research on identity, a companion website offering interactive content, and revised examples and exercises drawing from a global range of locations such as Tanzania, Wales, Paraguay, and Timor-Leste. Enhanced with updated further reading and reference sections, this text offers an engaging and accessible exploration of this captivating field.