Earlier quoted context omitted.
What are "functional cookies"? Are analytics/telemetries cookies functional? Are cookies identifying google users so they can receive targeted content but also ads "functional"? GDPR never bothered to specify. This is why GDPR is broken and sadly it broke the web.
Have you tried finding the answer to your question online? There are clear examples of what "functional cookies" mean, even straight from the EU.
This made GDPR in effect one of the most expensive regulations we had to implement as IT companies. It is also so incredibly punitive that everybody choose to implement it in the most conservative way possible, at the expense of the UX. Thus the cookie popups and banners.