This is the 189th most frequent Dutch word.
daarom
"Daarom" means "therefore" or "that's why."
Here, 'daarom' is used as a conjunctive adverb to explain the consequence of why they are staying at home.
Het regent vandaag, daarom blijven we thuis.
It's raining today, therefore we stay at home.
In this sentence, 'daarom' emphasizes the cause-effect relationship between his practice and winning.
Hij heeft veel geoefend; daarom heeft hij de wedstrijd gewonnen.
He practiced a lot; that's why he won the competition.
This sentence uses 'daarom' to provide a reasoning for being late.