Headphones are a type of audio device that allows users to listen to music, audio recordings, or other sounds privately. They typically consist of a pair of small speakers that sit on or over the ears, and are connected to an audio source such as a phone, computer, or music player. There are many different types of headphones available, including in-ear, on-ear, and over-ear designs. In-ear headphones, also known as earbuds, sit inside the ear canal and are often used for activities such as running or working out. On-ear headphones sit on top of the ear, while over-ear headphones completely cover the ear.

Headphones can also be wired or wireless, with wireless headphones connecting to audio sources via Bluetooth or other wireless technologies. Noise-cancelling headphones use special technology to block out external sounds, making them a popular choice for use in loud environments or for travel.

Headphones can also be open-back or closed-back. A open-back headphones are designed to let sound escape and let the listener hear their environment. Closed-back headphones, on the other hand, are designed to keep sound inside the headphones and block out external noise.

In recent years, the popularity of headphones has risen with the emergence of new technologies such as smart assistants, noise cancellation, and new audio codecs such as aptX or LDAC. With the rise of streaming services, headphones also have become an integral part of the entertainment experience, with many people opting for high-end headphones and earphones to get the best sound quality.