Noise cancellation is a technology designed to reduce unwanted sounds in our environment. It works by using microphones to pick up external noise and then creating sound waves that are the exact opposite, effectively canceling out the unwanted sounds. This is especially useful in noisy places like airplanes or busy offices, allowing people to focus better or enjoy their music without distractions. There are two main types of noise cancellation: passive and active. Passive noise cancellation involves physical barriers, like cushioned ear cups on headphones, that block sound. Active noise cancellation, on the other hand, uses electronic methods to counteract noise, making it a popular feature in high-quality audio devices.