An adverb is a word that modifies or describes a verb, an adjective, or another adverb. It often tells us how , when , where , to what extent , or under what conditions something happens.

Example of an adverb:

• She runs quickly.
  (Here, "quickly" describes how she runs.)

Other examples:

• He arrived early. (when)
• They live nearby. (where)
• She is very tall. (to what extent)

If you'd like, I can provide more examples or explain different types of adverbs!