This is the core product. LTSC stands for Long-Term Servicing Channel .
To understand what this file is, we have to decode the nomenclature:
This is the SHA-1 hash . In the world of software, this is a "digital fingerprint." It allows users to verify that the ISO file they have downloaded is authentic, unaltered, and hasn't been corrupted or injected with malware. What Makes LTSC 2021 Different?
This indicates the language pack is English (United States).
LTSC does not include the Microsoft Store, Cortana, or Microsoft Edge (though it can be added). You won’t find pre-installed games like Candy Crush or news widgets.
The hash is the "gold standard" for verification. If you download an ISO from a secondary source, you can use a hashing tool to check if it matches that code. If it does, you know you have the genuine, untouched Microsoft binary. Key Hardware Requirements
Microsoft commits to supporting this specific build with security updates for five years (and up to 10 years for IoT versions), without forcing "feature updates" that change the UI or system behavior.