What is an AV system for? Communication. When you have a message to communicate to a large group of people, and face to face or written communication won't do it, AV technology is used to get it across.
If you are making a presentation in a large auditorium, a sound system can help amplify your voice and people can see your gestures and expressions via live video feed. AV Tech helps you simulate a face to face interaction with thousands of people at once.
Learn more: https://www.avixa.org/what-is-av