Adverbs are words that describe the manner in which an action is being done, such as "quickly" or "slowly". In Korean, a common advervial marker is the suffix -게 (as in 빠르게) though there are common instances where different ones are used (related to language origin) such as 히 as in 안녕히 or words that simpl are adverbs in and of themselves (i.e., 빨리).