Book excerpt: This book, addressed to experienced and novice language educators, provides an up-to-date overview of sociolinguistics, reflecting changes in the global situation and the continuing evolution of the field and its relevance to language education around the world. Topics covered include nationalism and popular culture, style and identity, creole languages, critical language awareness, gender and ethnicity, multimodal literacies, classroom discourse, and ideologies and power. Whether considering the role of English as an international language or innovative initiatives in Indigenous language revitalization, in every context of the world sociolinguistic perspectives highlight the fluid and flexible use of language in communities and classrooms, and the importance of teacher practices that open up spaces of awareness and acceptance of --and access to--the widest possible communicative repertoire for students.