An adverb usually modifies a verb. It describes how, when, where, or to what degree the action verb is done. Pat dances carefully. Pat dances excessively. An adverb phrase or clause can also describe why.
Some adverbs can modify an adjective or another adverb.
These adverbs are called intensifiers. Pat dances quite gracefully. A conjunction joins words or groups of words. The words, phrases, or clauses joined by a coordinate conjunction must be equal or of the same type. John and Mary went to the store.