Content-based instruction focuses on teaching language through academic content. It uses three main methods: grammar-translation which focuses on rules and translation; direct method which uses only the target language; and audio-lingual which drills grammar through memorization without explicit instruction. Content-based instruction also uses learning activities to improve language skills, build vocabulary, develop discourse skills, and foster communication and study strategies. It aims to develop both declarative knowledge of content and procedural language knowledge as a tool for learning, as well as teaching learning strategies to promote learner autonomy.