KMS activators are commonly used in unofficial or unauthorized activations, and while it can offer activation without internet connectivity, it is often considered illegal and potentially harmful. Uses KMS (Key Management Service) to activate Microsoft products. Activates products without needing an online connection. Temporary activation, reactivation is needed periodically. Legal risks: Unofficial use may violate Microsoftâs terms of service. Not suitable for prolonged or business-related usage. Can be used on various editions of Office and Windows.