Headphones are a pair of small loudspeaker drivers worn on or around the head over a user’s ears. They convert electrical signals into sound, allowing the user to listen to audio privately without disturbing others. Headphones can be used with a variety of devices, such as smartphones, computers, music players, and more.

There are different types of headphones, including:

1. Over-Ear Headphones (Circumaural): These headphones have large ear cups that fully enclose the ears. They often provide the best sound quality and noise isolation but are typically larger and less portable.

2. On-Ear Headphones (Supra-aural): These rest on top of the ears rather than enclosing them. They are usually lighter and more portable than over-ear models but might offer less noise isolation.

3. In-Ear Headphones (Earbuds): These are small headphones that fit inside the ear canal. They are highly portable and often come with smartphones and other portable devices.

4. Wireless/Bluetooth Headphones: These connect to devices wirelessly via Bluetooth. They offer freedom from cables, making them popular for activities like exercise.

5. Noise-Canceling Headphones: These headphones use active noise-canceling technology to reduce unwanted ambient sounds, making them ideal for use in noisy environments like airplanes.

Headphones are used for a variety of purposes, including listening to music, watching videos, gaming, or making phone calls.