In the age of social media and constant digital sharing, privacy has become a rare commodity. We take photos of crowded streets, film vlogs in public parks, and capture moments at family gatherings. But often, these images and videos capture people who never gave permission to be seen by the world. Whether you are a parent trying to protect your child's identity, a journalist protecting a source, or a business owner ensuring you don't get sued for posting a customer's likeness, the ability to blur face details is a critical digital skill. It seems simple—just put a fuzzy patch over the face. But technologically, hiding an identity is complex. How do you ensure the blur is strong enough that it cannot be reversed? How do you track a face that is moving across a video screen? Why do some "censored" faces still look recognizable? In this comprehensive guide, we will explore the science, ethics, and techniques behind face blurring. We will explain the difference betwe...