KMS Activator is a software tool used to activate Microsoft products, including Windows and Office, by simulating a Key Management Service (KMS) server. Emulates a KMS server to activate Windows and Office. Activates products without needing an online connection. 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. Works with multiple versions of Microsoft Windows and Office.