This is the 504th most frequent Dutch word.
the
The Dutch word "the" does not exist. You might mean "de" or "het," which both mean "the" in English.
'De' is used as the definite article for the noun 'kat', which is a common gender noun.
De kat zit op het dak.
The cat is sitting on the roof.
'Het' serves as the definite article for the neuter noun 'boek'.
Het boek ligt op de tafel.
The book is on the table.
'De' again is the definite article, here for the common gender noun 'kinderen' (children).