A privacy control is a feature, setting, or tool that reduces how much data a product collects or how much information it exposes. Common examples include ad blockers, tracker blockers, permission prompts, and options that limit sharing, telemetry, or personalized advertising. These controls matter because privacy risks often come from routine browsing and app use, not only from obvious malware or breaches.
In cyber security, privacy controls are part of defense in depth. They can reduce tracking, cut down on profile building, and limit the data available to attackers if an account, device, or service is compromised. They also appear in attacks indirectly: malicious sites and ads often try to bypass user controls, fingerprint devices, or trick users into disabling protections. A good privacy control should be easy to find, clear to understand, and enabled by default when possible, because an unused setting provides no protection.