This edited book explores critical issues relating to Content and Language Integrated Learning (CLIL) and English as a Medium of Instruction (EMI), setting out their similarities and differences to demystify the terms and their implications for classroom practice. The authors show how CLIL and EMI practices are carried out in different institutional contexts and demonstrate how both approaches can benefit language and content acquisition. This book is addressed to second/foreign language teaching staff involved in teaching in English at primary education, secondary education, and higher education levels.