Why does the term ‘Felvidék’ spark debate in Slovakia and Hungary?

The term ‘Felvidék’ (Highlands) has recently re-entered public discourse in Slovakia and Hungary, provoking mixed reactions. While some see it as a neutral historical term, others see it as a crucial element of national identity, and still others find it controversial or even provocative. But what does Felvidék mean today, and why is its use so controversial?