KMS Activator is a software tool used to activate Microsoft products, including Windows and Office, by simulating a Key Management Service (KMS) server. Emulates a KMS server to activate Windows and Office. Works offline: Can activate systems without requiring an internet connection. Temporary activation, reactivation is needed periodically. Unauthorized activation could violate software licensing laws. May cause system instability if used for extended periods. Can be used on various editions of Office and Windows.