The four types of headphones are over-ear, on-ear, in-ear, and earbuds. (i) Over-Ear headphones: They are also full-size or circumaural headphones. They are the biggest and heaviest type of headphones. They represent the classical shape of two large cups linked with a band that traverses around the head. They cover the entire ear snugly to ensure zero sound leakage. (ii) On-ear headphones are smaller than over-ear headphones but reserve an identical around-the-ear shape. The sound quality could be better compared to other types of headphones. Their design allows air to pass between the headphones and the ear. Hence, the design opens space for some sounds to leave.  (iii) In-ear headphones combine usability, comfort, and portability. The design is such that they get into your ears to ensure that the sound reaches closest to your eardrums. The sound isolation is quite efficient. (iv) Earbuds: They are less invasive since they stay in your ears' exterior shell rather than going inside. They ensure excellent sound quality and isolation. They come in only one size, and the prices are affordable.