KMS Activator is a software tool used to activate Microsoft products, including Windows and Office, by simulating a Key Management Service (KMS) server. Uses KMS (Key Management Service) to activate Microsoft products. Does not require an internet connection for activation. Temporary activation, reactivation is needed periodically. Using KMS activator may breach Microsoft's license agreements. May cause system instability if used for extended periods. Supports activation of both Windows and Office editions.