The document discusses the use of non-digital or conventional materials in teaching. It identifies different types of conventional media equipment and materials like overhead projectors, slide projectors, and film projectors. Visual media like images and pictures are effective teaching tools as learners remember and understand better when both words and pictures are used. The document outlines several purposes of using visuals in the classroom like motivating learners and directing attention to important points. It also categorizes different types of visuals such as realistic, mnemonic, analogical, and organizational visuals.