This document discusses instructional aids, which are devices that assist instructors in teaching. It defines instructional aids and explains their importance in clarifying concepts, making classrooms lively, allowing direct learning experiences, and motivating students. The document then categorizes instructional aids as projected aids like films, slides and LCD projectors; non-projected graphic aids like diagrams, maps and flashcards; display boards like blackboards and bulletin boards; three-dimensional aids like models and objects; and audio aids like radio.