Adverbs are one of the four major word classes, along with nouns, verbs and adjectives. Adverbs are words that describe or give more information about a verb, adjective, adverb, or phrase. For example:

• verbs – She walked slowly.
  The adverb answers how she walked – slowly.
• adjectives – He drove a very fast car.
  The adverb describes how fast his car was – very.
• other adverbs – It moved quite slowly down the mountainside.
  The adverb describes how slowly it moved – quite.