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. Does not require an internet connection for activation. Requires periodic reactivation every six months. Legal risks: Unofficial use may violate Microsoft’s terms of service. Not suitable for prolonged or business-related usage. Compatible with a wide range of Windows and Office versions.