Campaigns define the rewards that a user will recieve when they do incentivized behavior in the system. IT defines the boundaries for the campaign vai rules, and sets the reward via Rewards. A campagin can be utilized via Coupon's, Promo's or Referrlas if it is referenced with a referral.
https://reel-dev.atlassian.net/wiki/spaces/RD/pages/5865496/Campaigns