Retail keys follow you; static keys do not. If you upgrade your motherboard or get a new PC, that static key dies with the old hardware. You will have to buy another key.
These require zero ongoing management or server communication after the initial entry. When are Static Keys Used? microsoft static activation keys
How do I get a windows 11 activation key free or at cheap price? Retail keys follow you; static keys do not
These allow for multiple installations but do require activation against Microsoft’s hosted services for each device. Retail keys follow you
If you need a "static" feel for Microsoft software:
and permanently consumes one activation from the license pool. No Periodic Renewal