An adjective phrase modifies a noun and consists of an optional adverb phrase followed by an adjective. Adjective phrases function as subject complements following a linking verb, object complements modifying a direct object, or as pre-modifiers within a noun phrase. They define attributes and characteristics of nouns. Examples are provided such as "the fat brown dog" where "fat brown" is the adjective phrase modifying the noun "dog", and "John made Kate angry" where "angry" is the object complement adjective phrase modifying the direct object "Kate".