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. Operates without internet access for activation. Activation expires after 180 days, requiring renewal. KMS activator usage might be illegal according to Microsoft’s policies. Not ideal for continuous or commercial use due to potential risks. Supports activation of both Windows and Office editions.