This is the 295th most frequent German word.
warum
"Warum" means "why" in English.
'Warum' is used here as an interrogative adverb to ask for a reason or cause.
Warum bist du heute so müde?
Why are you so tired today?
'Warum' serves as a subordinating conjunction to introduce an indirect question.
Sie fragte mich, warum ich zu spät gekommen war.
She asked me why I had arrived late.
'Warum' is used as a part of the indirect question, seeking an explanation for a phenomenon.