How does KMS Activator work for Windows?

I've heard about using a KMS Activator for activating Windows. Can someone explain how it works and if it's effective?

A KMS Activator is a tool that helps activate Windows by simulating a Key Management Service (KMS) server, allowing the system to authenticate locally. This method is widely used and considered effective. For more details on how KMS Activator Windows works and its benefits, visit the official KMS website.