What do Draft, Scheduled, Live, and Ended mean?

Draft and Live describe a campaign's lifecycle, while Scheduled and Ended are derived from its dates. Preview means a saved draft is visible only through its private preview link. These labels are separate from publication freshness: a Live or Scheduled campaign can still have unpublished changes, and a scheduled campaign must be published before it can start on the store. Checkout uses only published campaigns that are currently eligible.