This is the 8th most frequent Dutch word.
die
The Dutch word "die" means "that" or "those" (used for people or objects, as a relative pronoun or demonstrative).
In this sentence, 'die' acts as a relative pronoun referring to 'de man' (the man).
De man die daar staat, is mijn vader.
The man who is standing there is my father.
Here, 'die' is a demonstrative pronoun pointing to a specific car.
Ik hou van die auto.
I love that car.
In this case, 'die' is used as a demonstrative pronoun replacing a noun.