Headphone size can affect the balance between fidelity and portability. Generally, headphone form factors can be divided into four separate categories: circumaural, supra-aural, earbud, and in-ear.

Circumaural headphones have large pads that surround the outer ear. Because of their size, circumaural headphones can be heavy and there are some sets that weigh over 500 grams.

Supra-aural headphones have pads that press against the ears, rather than around them. Supra-aural headphones can also lead to discomfort due to the pressure on the ear as compared to circumaural headphones that sit around the ear. Comfort may vary due to the earcup material.

Open-back headphones have the back of the earcups open. This leaks more sound out of the headphone and also lets more ambient sounds into the headphone, but gives a more natural or speaker-like sound and more spacious "soundstage" - the perception of distance from the source.

Closed-back (or sealed) styles have the back of the earcups closed. They usually block some of the ambient noise, but have a smaller soundstage, giving the wearer a perception that the sound is coming from within their head. Closed-back headphones tend to be able to produce stronger low frequencies than open-back headphones.

Semi-open headphones, have a design that can be considered as a compromise between Open-back headphones and Closed-back headphones.

Earphones are very small headphones that are fitted directly in the outer ear, facing but not inserted in the ear canal. Earphones are portable and convenient, but many people consider them to be uncomfortable and prone to falling out.

In-ear headphones, also known as in-ear monitors or canalphones, are small headphones with similar portability to earbuds which are inserted in the ear canal itself. Because in-ear headphones engage the ear canal, they can be less prone to falling out and they block out much environmental noise.

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