Der rote Apfel ist lecker.
English: The red apple is tasty.
Adjective declension after the definite article in German means changing the ending of an adjective when it comes after 'der', 'die', or 'das'. This helps show the gender, case, and number of the noun.
Use this form when an adjective comes directly after a definite article (der, die, das) and before a noun. It shows the correct gender, case, and number of the noun in German sentences.
Der rote Apfel ist lecker.
English: The red apple is tasty.
Ich sehe die kleine Katze.
English: I see the small cat.
Das neue Auto ist schnell.
English: The new car is fast.
Wir kaufen die frischen Eier.
English: We are buying the fresh eggs.