Noise-cancelling headphones

Noise-cancelling headphones are headphones that reduce unwanted ambient sounds using active noise control (ANC), a technology that electronically minimizes external noise by generating sound waves that interfere destructively with incoming sounds. They are commonly used in environments with persistent background noise, including aircraft cabins, trains, offices, industrial workplaces, and urban environments.

Source: Wikipedia — Noise-cancelling headphones (CC BY-SA 4.0)