An adverb is a word that modifies verbs, adjectives, other adverbs, and clauses. Adverbs provide description of how, where, when, in what manner, and to what extent an action is performed. Common types of adverbs include adverbs of manner (slowly, badly), place (here, there), frequency (usually, hourly), time (yesterday, now), and purpose (so, because). Adverbs help paint a fuller picture and provide context for verbs and other parts of speech.