Bilingualism and Bilingual Education: Conceptos Fundamentales explores relevant concepts of bilingualism for pre-service Spanish/English bilingual teachers in the United States. This volume is reader friendly while presenting complex theoretical content. It is the first of its kind to seamlessly switch between English and Spanish languages for academic purposes. This book fills a gap in the academic literature related to translanguaging as a modern and global phenomenon. The authors invite bilingual educators to develop translingual classrooms with bilingual students in which academic English and Spanish are intentionally mixed. Volume contributors center their discussions on theory, practice, and action as they reflect on their own bilingual journeys. Features such as glossary terms, discussion questions, and intentional reflection on each authors bilingual journey make it innovative and a must read in all bilingual teacher preparation programs in the nation.