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Closed headphones are a type of headphones where the ear cups are completely closed to provide sound isolation. In contrast, open headphones have holes in the ear cups for sound to enter and escape.
The sound isolation provided by closed-back headphones has many advantages. They can be worn in a noisy environment without distracting background noise interfering with the enjoyment of the music. They also provide a degree of privacy, as the music does not leak out and other people are not disturbed.

Another advantage of closed headphones is the bass response. Since the sound is trapped inside the headphones, the bass can be better controlled and a powerful sound is produced.
However, there are also disadvantages to closed-back headphones. They tend to get warmer than open headphones because the heat is trapped inside the ear cups. They can also feel uncomfortable when worn for extended periods of time.

Still, closed-back headphones are a popular choice for many people, especially for use in the studio or on the go. They offer good sound isolation and powerful sound, which makes them ideal for music lovers and professionals who value high sound quality.