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. Offline activation method. Temporary activation: Typically requires reactivation every 180 days. Legal risks: Unofficial use may violate Microsoft’s terms of service. Not suitable for prolonged or business-related usage. Available for use on Windows and Office products (various versions).