A "modifier" is a word or phrase that adds detail or clarification to another word, typically a noun or verb, in a sentence. Modifiers help to provide more information, making sentences clearer and more descriptive. For example, in the phrase "the red car," the word "red" is a modifier that describes the color of the car. Modifiers can be adjectives, adverbs, or phrases. Adjectives modify nouns, while adverbs modify verbs, adjectives, or other adverbs. For instance, in the sentence "She runs quickly," the word "quickly" is an adverb modifying the verb "runs," indicating how she runs. Proper use of modifiers enhances writing by adding depth and specificity.