An adjective is a word used to modify, or describe, a noun or pronoun. An adjective usually answers one of these questions: Which one? What kind of? How many?
Adjectives usually precede the words they modify. They may also follow linking verbs, in which case they describe the subject. (See B2-b.)
The definite article the and the indefinite articles a and an are also classified as adjectives.
Some possessive, demonstrative, and indefinite pronouns can function as adjectives: their, its, this, all (see B1-b). And nouns can function as adjectives when they modify other nouns: apple pie (the noun apple modifies the noun pie; see B1-a).
tip: You can find more details about using adjectives in G4. If you are a multilingual writer, you may find help with articles and specific uses of adjectives in M2, M4-a, and M4-b.