This is the 5th most frequent Hungarian word.
az
"The" or "that" (determiner/pronoun).
In this sentence, 'az' is used as a definite article meaning 'the', referring to the car.
Az autó az utcán parkol.
The car is parked on the street.
Here, 'az' functions as a demonstrative pronoun meaning 'that', referring to the specific statement made.
Az, amit mondott, igaz.
That what he said is true.
In this sentence, 'az' is used as a definite article, preceding the noun 'irodalmat' to indicate a general reference to literature.