However, as with any modified ISO, proceed with caution. Always verify the source of your download and ensure you have a backup of your data before wiping your drive.
The x is a wildcard. In official terms:
While Microsoft does not offer an official "Lite" edition, community-developed "Lite" or "SuperLite" builds for versions 21H1 and 21H2 are popular for old PCs or gaming. Typical modifications include: windows 10 lite version 21h221h1 build 1904x1387 fixed