Subwoofers are specialized speakers designed to reproduce low-frequency sounds, such as bass and thumps. They are commonly used in home theatre systems and car audio systems to enhance sound quality and create deeper, richer audio effects. Subwoofers can be either active, with a built-in amplifier, or passive, which require an external amplifier. Their primary purpose is to add power and depth to the audio spectrum, making music listening and movie watching more immersive.