For enterprise environments, KMS is a godsend. Instead of typing 25-digit product keys for hundreds of computers, a local KMS host is set up. Every client computer points to this host, and the host handles activation. This is efficient, offline-friendly (after initial setup), and easy to manage.
Note: digiboy.ir appears to be a real website associated with software activation tools, and “KMS” refers to Key Management Service, commonly used for Microsoft product activation. The following is a fictional, cautionary narrative based on typical experiences with unofficial KMS tools.
However, the term "KMS" has also become synonymous with third-party emulators —software that mimics a legitimate KMS host to activate unauthorized copies of Microsoft Windows and Office.
Crack tools like the one from digiboy.ir simulate this server locally. The tool modifies system files and installs a fake KMS service, which responds to activation requests as if it were a genuine Microsoft server.