Task-based language teaching (TBLT) is an approach that uses tasks as the core unit of planning and instruction. A task is an activity or goal carried out using language. The key principles of TBLT are that language is used for meaningful communication, lessons involve purposeful activities and tasks, and learning a language is best when it mirrors real-world language use. TBLT focuses on the process of learning through tasks that provide opportunities for input, output, and negotiation of meaning rather than solely teaching language structures. The teacher takes on roles like selecting and sequencing tasks, preparing learners, and raising learner consciousness of the language.