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 then generate sound waves that are the exact opposite, effectively canceling out the noise. These headphones come in two main types: active and passive. Active Noise Cancelling (ANC) headphones use electronic circuitry to counteract noise, while Passive Noise Cancelling relies on physical design to block sound. Both types are popular among travelers and commuters who seek a quieter listening experience.