This document discusses Content and Language Integrated Learning (CLIL), an approach to teaching subjects in a foreign language to improve both content knowledge and language skills. It provides an overview of CLIL, including definitions, benefits, different models of implementation, and considerations for applying CLIL such as teacher training, curriculum design, and methodology. Challenges of CLIL are also addressed, such as ensuring comprehension for students with varying language abilities and balancing language accuracy and content coverage.