The country is called Holland
Same thing, new accepted name.
TaughtHolland and the Netherlands are two names for the same country, used interchangeably. The tulips, the windmills, the football team in orange, all of it is Holland.
NowFrom January 2020 the Dutch government officially dropped 'Holland' as a promotional name for the country and uses only 'the Netherlands'. Holland is really just two of the country's twelve provinces, North and South Holland, and the government retired the nickname to represent the whole nation.
What actually happened
The name confusion is old and geographic. Holland was historically the wealthiest, most powerful region of the country, home to Amsterdam, Rotterdam, and The Hague, so foreigners took the part for the whole, the same way people once said 'England' for the whole United Kingdom. But the other ten provinces, Friesland, Brabant, Limburg and the rest, are not in Holland at all, and their residents have never loved being called Hollanders.
The 2020 change was a deliberate rebrand, complete with a new logo joining the letters NL to an orange tulip, unveiled in time for the Tokyo Olympics and the Eurovision Song Contest that the country was hosting. The stated reasons were partly image, presenting the Netherlands as more than Amsterdam's canals and coffee shops, and partly to spread tourism beyond a capital that was straining under visitor numbers.
It is a change of official usage rather than of the country's legal name, which was always the Netherlands ('Nederland'). But the sanctioned nickname is gone: government ministries, embassies, and the tourist board no longer market 'Holland', and a student taught that the two words are simply interchangeable is now, officially, out of date.
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Who was taught this
Still standard through 2020, so anyone who finished school between 1950 and 2020 learned the earlier version.