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, or sadly are all adverbs. Adverbs usually, but not always, end in -ly.
- The man walked slowly.
- The dog barked loudly.
- the girl wrote neatly.
Examples with added adjectives:
- The frail man walked slowly.
- The volatile dog barked loudly.
Adverbs can be added to sentences along with adjectives as a cheap way to add length to your sentences, but this shouldn't be overused.