A headphone amplifier is a device designed to boost the audio signal from a source, such as a smartphone or computer, to drive headphones more effectively. It enhances sound quality and volume, making it particularly useful for high-impedance headphones that require more power to perform optimally. These amplifiers can be standalone units or built into other devices. They come in various forms, including portable models for on-the-go use and desktop versions for home setups. By improving audio clarity and detail, headphone amplifiers provide a better listening experience for music enthusiasts and audiophiles alike.