This module discusses the importance of interaction in language classrooms. It notes that student talk typically accounts for less than 30% of classroom talk. Studies show that students learn language through asking questions. However, student questioning drops off when formal schooling begins. The module considers different types of interactions in the classroom, including between teacher-student and student-student. It also addresses the goals of classroom interaction and using both the target language and students' first language to support learning. Teachers are encouraged to reflect on interaction in their own classrooms.