A "modifier" is a word or phrase that adds detail or description to another word, typically a noun or verb. Modifiers help clarify meaning and provide more information, making sentences richer and more precise. For example, in the phrase "the red car," the word "red" modifies the noun "car" by describing its color. Modifiers can be adjectives, adverbs, or phrases. Adjectives modify nouns, while adverbs modify verbs, adjectives, or other adverbs. In the sentence "She runs quickly," the adverb "quickly" modifies the verb "runs," indicating how she runs. Proper use of modifiers enhances communication by providing clearer imagery and context.