Un chat noir.
English: A black cat.
In French, descriptive adjectives (adjectifs qualificatifs) are words that describe nouns. They change form to match the gender (masculine/feminine) and number (singular/plural) of the noun, and their position is usually after the noun.
Use descriptive adjectives to give more information about a noun, such as its color, size, or quality. In French, adjectives usually come after the noun they describe.
Un chat noir.
English: A black cat.
Une maison blanche.
English: A white house.
Des fleurs rouges.
English: Red flowers.
Un homme intelligent.
English: An intelligent man.
Des filles heureuses.
English: Happy girls.