Headphones

Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby to hear.

Headphones are also known as earphones or, colloquially, cans.
Circumaural and supra-aural headphones use a band over the top of the head to hold the drivers in place.
Another type, known as earbuds or earpieces, consists of individual units that plug into the user's ear canal; within that category have been developed cordless air buds using wireless technology.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0