Compliance & regulation
A type of EU law that sets goals every member state must reach, but lets each country write its own national law to do it.
Formal
A legal act of the European Union that is binding on each member state as to the result, but leaves the form and method to national authorities; it must be written into national law by a deadline, as with NIS2 and the Danish NIS2 Act.
In plain English
Like a parent telling several teenagers "your rooms must be clean by Sunday" - the goal is fixed, but each decides how to get there.
In practice
The IT department of a Danish region does not read NIS2 itself to find its hospitals' duties; it follows the Danish NIS2 Act, which puts the directive into force and names the Danish authorities.
Why it matters
Because each country writes its own version, details and deadlines can differ between countries, so organisations working across borders must check each national law.