KMS Activator is a software tool used to activate Microsoft products, including Windows and Office, by simulating a Key Management Service (KMS) server. Bypasses Microsoft activation using KMS protocol. Works offline: Can activate systems without requiring an internet connection. Requires periodic reactivation every six months. Using KMS activator may breach Microsoft’s license agreements. Not ideal for continuous or commercial use due to potential risks. Works with multiple versions of Microsoft Windows and Office.