This is the 252nd most frequent Swedish word.
därför
"Therefore" or "that's why."
In this sentence, 'därför' is used as a conjunction meaning 'therefore', connecting a cause with its consequence.
Jag är hungrig, därför ska jag laga mat.
I am hungry, therefore I will cook.
Here, 'därför att' is used as a subordinating conjunction meaning 'because', providing a reason for the action in the main clause.
Därför att det regnade, stannade vi inomhus.
Because it was raining, we stayed indoors.
In this example, 'det var därför som' is used to explain the reason for something that happened, functioning as an adverbial expression.