Noise-cancelling technology is designed to reduce unwanted ambient sounds. It works by using microphones to pick up external noises and then generating sound waves that are the exact opposite, effectively canceling them out. This process is commonly found in devices like headphones and earbuds, allowing users to enjoy music or podcasts without distractions. There are two main types of noise-cancelling: passive and active. Passive noise-cancelling relies on physical barriers, such as cushioned ear cups, to block sound. In contrast, active noise-cancelling uses electronic methods to counteract noise, making it particularly effective in environments like airplanes or busy offices.