Noise-Cancelling Headphones are designed to reduce unwanted ambient sounds, allowing users to enjoy music or podcasts without distractions. They use microphones to pick up external noise and generate sound waves that cancel it out, creating a quieter listening experience. These headphones come in two types: active and passive. Active Noise-Cancelling headphones use electronic circuitry to counteract noise, while Passive Noise-Cancelling headphones rely on physical design to block sound. Both types are popular among travelers and commuters who seek a more peaceful environment.