A headphone is a small listening device that is worn on or over the ears to listen to audio content. It typically consists of an earpiece and a cable connected to a player, such as a smartphone, tablet, computer or dedicated music player. Headphones can also include active noise-cancelling technology which reduces external sound levels, allowing for better focus on the audio being played through them. They are commonly used by individuals who want to listen to music, podcasts, videos or other media without disturbing others around them.