This is the 73rd most frequent Danish word.
derfor
"Therefore" or "for that reason."
The word 'derfor' indicates the reason or purpose linked to the preceding clause.
Jeg har fri i dag, og derfor skal jeg besøge min ven.
I have a day off today, and therefore I shall visit my friend.
In this sentence, 'derfor' serves to explain the motivation behind the second action.
Hun elsker blomster, og derfor køber hun dem ofte.
She loves flowers, and therefore she often buys them.
Here, 'derfor' connects the two clauses with cause and outcome, linking the reason for an action.