Headphones are a pair of small speakers that are worn over or in the ears. They allow users to listen to audio from devices like smartphones, computers, and music players without disturbing others. Headphones come in various styles, including over-ear, on-ear, and in-ear, each offering different levels of comfort and sound quality. Many headphones also feature additional technologies, such as noise cancellation, which helps block out external sounds, and wireless connectivity, allowing for a more convenient listening experience. Popular brands include Sony, Bose, and Apple, each offering a range of products to suit different preferences and budgets.