KMS Auto is a widely used software tool designed to activate Microsoft Windows and Office products without requiring a valid product key. It works by emulating a Key Management Service (KMS) server, which is typically used in volume licensing environments. This virtual server activates the software by tricking the system into thinking it’s receiving a legitimate activation from an authorized server. The process can bypass Microsoft’s activation mechanism, providing a solution for users who might not have a genuine license key or wish to activate their products without direct intervention from Microsoft.