This document discusses the use of audio-visual aids in teaching English as a second language. It begins by outlining the history of audio-visual aids from the middle ages to modern times. It then provides definitions of audio-visual aids from several scholars as any device that can make learning more concrete, realistic and dynamic. The theoretical background section explains how audio-visual aids were used in different teaching methods like the oral-situational approach. The importance of using audio-visual aids is that they help avoid meaningless verbalization, provide direct experiences for students, and make teaching more effective. Finally, it explains that audio-visual aids help create a natural language environment, make learning easier, and save time by explaining ideas precisely.