KMSpico is a software tool designed to activate Microsoft products, such as Windows and Office, without requiring a valid product key. It utilizes a method called KMS (Key Management Service), which mimics a local KMS server on the user’s computer. When activated, the software connects to this server to validate the product, making it appear as though the user has a legitimate license. While KMSpico is popular for its ease of use, it’s important to note that using it may violate Microsoft’s terms of service and could pose security risks, as it often comes from unofficial sources.