This document discusses teaching aids and their importance in education. It defines teaching aids as any supplementary material that helps make teaching more engaging, participatory, motivating and effective. It categorizes different types of teaching aids such as audio, visual, audio-visual, mnemonic and human interaction aids. The document highlights several advantages of teaching aids, including that they help students retain information better when multiple senses are engaged. It also outlines principles for selecting the right teaching aids and effectively using them in the classroom.