This is the 18091st most frequent Polish word.
żółte
"Żółte" means "yellow" in English.
In this sentence, 'żółte' is an adjective, modifying the plural noun 'jabłka' (apples), describing their yellow color.
Mam żółte jabłka.
I have yellow apples.
Here, 'żółte' again acts as an adjective describing the noun 'ptaki' (birds), attributing to them the yellow color, and is in plural form as the noun is plural.
Widziałem żółte ptaki w parku.
I saw yellow birds in the park.
In this instance, 'żółte' describes 'płatki' (petals), showing agreement in gender, number, and case with the noun it modifies.