Windows 10 long term servicing channel. It’s intended for things like electronic signs but works great if you just want un bloated windows. It comes with most of the random bullshit not installed and has a longer period of security updates.

In addition to what Hangon said, some copies of LTSC 10 still have support until 2027 unlike other Windows 10 versions.

If you wanted to try it out on a spare device without buying then ye’d be digging yerself a massgrave wink.