An adverb is a word that modifies a verb, adjective, or other adverb by describing manner, time, place, frequency or degree. There are different types of adverbs including adverbs of manner, time, place, frequency, degree, interrogation, and negation. Adverbs can be placed in initial, mid, or end position within a sentence, with certain adverb types restricted to specific positions. Adverbs are commonly used to make writing more descriptive.