CLIL (Content and Language Integrated Learning) is an umbrella term that covers various educational approaches where lessons have two main aims - one related to a particular subject or topic, and one linked to language learning. It is a dual-focused approach where neither the content nor the language is dominant. CLIL aims to accelerate learning through an integrated, holistic and symbiotic view of language and content. Potential benefits include improved language skills, increased motivation for learning languages and content, and professional satisfaction for teachers. However, CLIL also presents challenges such as the complexity of balancing language and content, determining who teaches CLIL lessons, potential threats to the native language, and a lack of clear methodology and assessment.