Manual on audio-visual aids for extension techniques

Audio Visual Aids are also called instructional material. There are various types of audiovisual materials ranging from filmstrips, slides, projected opaque materials, tape recording and flashcards. In the current digital world, audiovisual aids have grown exponentially with several multimedia such as educational DVDs, PowerPoint, television educational series, YouTube, and other online materials. The goal of audio-visual aids is to enhance teacher's ability to present the lesson in simple, effective and easy to understand for the students. Audiovisual materials make learning more permanent since students use more than one sense.