KMS Activator is a software tool used to activate Microsoft products, including Windows and Office, by simulating a Key Management Service (KMS) server. Allows activation of Microsoft software via KMS server simulation. Activates products without needing an online connection. Requires periodic reactivation every six months. Legal risks: Unofficial use may violate Microsoft’s terms of service. Not recommended for long-term or commercial use, as it may lead to software instability or security risks. Can be used on various editions of Office and Windows.