Kmspico is a popular tool used to activate Microsoft Windows and Office products. It operates by emulating a Key Management Service (KMS) server on your local machine. KMS is a technology developed by Microsoft for volume licensing, allowing organizations to activate multiple copies of Windows or Office using a single activation key. Kmspico mimics this server, tricking the software into thinking it has been activated through legitimate means. However, using Kmspico involves risks, as it is an unofficial tool and might be considered illegal in some jurisdictions.