Active Noise Cancellation (ANC) is a technology that reduces unwanted ambient sounds by using microphones to pick up external noise and generating sound waves that are the exact opposite (anti-phase) to those noises. This process effectively cancels out the background sounds, allowing users to experience clearer audio or quieter environments. ANC is commonly used in headphones and earbuds, but it can also be found in various security and privacy devices to prevent eavesdropping or interference. While not directly a cybersecurity tool, ANC can contribute to secure communications by minimizing the risk of sensitive information being overheard in noisy environments.