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. Offline activation method. Activation expires after 180 days, requiring renewal. KMS activator usage might be illegal according to Microsoft's policies. Not recommended for long-term or commercial use, as it may lead to software instability or security risks. Supports activation of both Windows and Office editions.