What is the purpose of a public address system?

The purpose of a public address system is fundamentally to facilitate communication with the public for announcements. This system plays a crucial role in situations where it is essential to relay important information quickly and clearly to a large audience, such as during emergencies, safety drills, or general announcements in public spaces. The ability to broadcast messages efficiently can help ensure that individuals receive timely instructions or notifications, enhancing their safety and awareness in various scenarios.

The other options, while related to technology and communication in some way, do not accurately reflect the primary function of a public address system. Amplifying music serves a different purpose, focusing more on entertainment rather than communication. Providing technical support for building systems and controlling the building's power supply pertains to operational and maintenance tasks, which are outside the scope of what a public address system is designed to do.