Headphones, also known as They are also known as stereophones or headsets or earbuds or informally cans, are a pair of small loudspeakers or single speaker with a way of holding them close to users ears and a method of connecting to a signal source including MP3 player or radio or CD player.

Earcup rest on the exterior of the ear and were the earliest headphone form designed. Other forms include full size headphones, Earbuds, plus in-ear headphones such as Canalphones.

Popular Headsets brands include Westone 1 Earphones With Free iPod Speakers, Westone UM2 Dual Driver In-Ear Earphones Black, Westone UM1 Single Driver True Fit In-Ear Earphones and Westone 3 True 3-Way Driver Earphones.

Headphones employ one or more of several methods of sound reproduction Electret or Orthodynamic or Balanced armature or Electrostatic. There are other much less common Transducer Technologies include Piezoelectric film, Plasma-ionisation and Heil Air Motion Transformer.