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The main advantage of an amplifier is that it increases the strength (or power) of a weak signal, allowing it to drive speakers, transmit over long distances, or be processed more effectively. In simple terms, it takes a small input signal (like a sound from a microphone or a weak radio signal) and boosts it to a level that can be heard clearly or used for further processing. This is important in many applications like audio systems, communication systems, and electronic devices.