CLIL (Content and Language Integrated Learning) refers to teaching subjects through a foreign language with the dual aims of learning content and language simultaneously. It is not simply translating first language teaching, nor is it just disguised grammar lessons. There is no single CLIL model as the context must be considered. The main aims of CLIL are to acquire knowledge and language skills through the target language, understand both cultures, and develop cognitive and social abilities. Key aspects of CLIL include group work, projects, student mobility, and formative assessment. It emphasizes a lexical rather than grammatical approach where language is based on the context of the subject and students are not afraid of making mistakes.