Headphones are electronic audio devices that people wear over their ears. They let people hear sounds on a walkman, MP3 player, mobile phone or computer. Headphones come in many different sizes from big to small. They are also known as earphones, stereophones, headsets or even 'cans'. </nowiki>Earbuds are inserted into the ear. Headphones typically uses small plug for connection. Some use a Bluetooth connection so they don't have the cord in the way.