The document discusses teaching-learning materials (TLM), which are sensory objects or images used to stimulate learning. TLMs make teaching more concrete, realistic, and dynamic. They should be integrated into the educational program, cost-effective, provide multi-sensory experiences, be relevant to real life, and promote active learning. Examples of TLMs include actual objects, flashcards, slides, charts, pictures, and models. TLMs can be classified as traditional (books), visual (posters, maps), mechanical (recorders, projectors), or audio-visual (videos, films). They have advantages like aiding new learning and meeting individual student needs.