Active Noise Cancellation (ANC) is a technology designed to reduce unwanted ambient sounds. It works by using microphones to pick up external noise and then generating sound waves that are the exact opposite, or "anti-noise." When these opposing sound waves meet, they cancel each other out, resulting in a quieter environment. ANC is commonly found in devices like headphones and earbuds, making them popular for travelers and those in noisy settings. This technology helps improve focus and relaxation by minimizing distractions from sounds like traffic, airplane engines, or conversations.