This document discusses instructional materials and media used in language teaching. It defines instructional materials as anything used by teachers or learners to facilitate language learning, including textbooks, videos, and tasks. Materials should stimulate learning and represent effective language learning. The document also defines instructional media as channels of transmitting content, like technologies, and notes media can engage learners, save time, and reinforce concepts if designed and used properly. The functions of materials and role of media in language teaching are described. Interactive learning using media is emphasized, as it leads to active involvement and makes teaching more engaging.