This is the 2nd most frequent Catalan word.
que
"Que" in Catalan is a conjunction meaning "that," or a pronoun meaning "which" or "what," depending on the context.
In this context, 'què' is an interrogative pronoun used to ask questions about things or meanings.
Què significa aquesta paraula?
What does this word mean?
Here, 'que' is a conjunction used to introduce a subordinate clause indicating the content of thinking.
Crec que arribaré tard.
I think that I will arrive late.
In this sentence, 'que' is a conjunction used after 'tan' to indicate the result or consequence of a description.