Adverbs can be important in creative writing because they make the verb more descriptive for the reader. This enables the reader to create a more vivid image of the words they read and make it a more enjoyable experience. However, adverbs shouldn’t be used too much!
Adverbs and adjectives are similar because they describe something by modifying other words, called nouns and verbs. Whether these descriptive words are called adverbs or adjectives depend on which kind of words they modify.