Teaching aids are objects or materials that teachers use to help students understand concepts. They involve the senses of hearing, sight, touch, and sometimes smell. There are three main types: audio aids which involve hearing like radios; visual aids which involve sight like pictures and charts; and audio-visual aids which involve both hearing and sight like videos. Teaching aids have important benefits like clarifying ideas, motivating students, making lessons more lively and active, giving direct experiences, and helping learning be more permanent. However, they also have some drawbacks like taking more time, needing space, being expensive, and sometimes causing distraction.