Field descriptions in Dynamic Tag Management for referrers and campaign options when deploying Dynamic Tag Management in Adobe Analytics.
Property] > Edit Tool > Referrers & Campaigns
Overrides the value set in the s.referrer variable, which is typically populated by the referrer set in the browser.
A variable that identifies marketing campaigns used to bring visitors to your site. The value of campaign is usually taken from a query string parameter.
Use the DTM interface to choose whether you want to use a Query String or Value (which could pull from a data element):
You can either enter your query string directly in the interface, or you can reference a separate data element if you have other means of tracking a campaign.