Headphones are personal audio devices that are used to listen to music or other audio content privately. They consist of two earpieces connected by a headband or a wire, and are typically designed to fit over the ears. Headphones come in various types such as over-ear, on-ear, and in-ear, and can be wired or wireless. They enhance the listening experience by canceling out background noise and providing clear, high-quality sound. Headphones are widely used for listening to music, watching videos, making phone calls, and playing video games. Some headphones also have additional features like built-in microphones, noise-cancellation, and touch controls for convenience.