An adverb is a word used to tell more about a verb, and it almost always answers the questions how?, when?, where?, how often?, and in what way?. Words like slowly, loudly, carefully, quickly, quietly or sadly are all adverbs. Adverbs usually, but not always, end in -ly.
Examples of adverbs in a sentence (with the adverb in italics):
An adverb can also modify (describe) an adjective or another adverb
Examples: