Holland is a province, Netherlands is the word you should use.
Everyone that disagrees with that is a old redneck farmer wearing wooden shoes and a cheese addict
I'm Frisian, so calling me 'hollander' is a grave insult.
So I'm from the Netherlands, and I'm Dutch.
Funny thing: I know a lot of people from Rotterdam who get offended when anyone refers to them as 'hollander.' Even though Rotterdam is geographically in Holland, they're quite prone to anger when people remind them.
So it's probably important to note that the Netherlands is quite divided, and quite a lot of people in the Netherlands really dislike Holland. Mostly, this is because of civil wars and such way back.
I call it either Low countries or Holland because "the Netherlands" doesn't exist in my language.
To make matters worse, in my language, Germans are sometimes called Švabi, after the region of Swabia.
In Romania we call you Olanda.
On the other hand, we also call the UK Anglia
And of course, we call Switzerland Elvetia. Because we can.
So, in general, sometimes when talking online I traduce is wrong, as Holland instead of Netherlands.