KMS Activator is a software tool used to activate Microsoft products, including Windows and Office, by simulating a Key Management Service (KMS) server. Uses KMS (Key Management Service) to activate Microsoft products. Operates without internet access for activation. Temporary activation: Typically requires reactivation every 180 days. Legal risks: Unofficial use may violate Microsoft’s terms of service. Long-term use may cause technical issues or security vulnerabilities. Compatible with a wide range of Windows and Office versions.