The hierarchy of Facebook Ads setup is as follows: Ad Campaign - At the highest level for each initiative you will set a campaign with an Objective. Each Ad Campaign will have a Campaign ID (campaign_id), analogous to Campaigns in Google Ads. Ad Set - A campaign will have multiple Ad Sets associated with it, with settings for how, when, and where to run. Ad Sets share the same Objective as the Campaign and are identified with a unique Ad Set ID (adset_id). Facebook Ads - Individual pieces of content under a single Ad Set, identified by a unique Ad ID (ad_id). Facebook allows up to 5,000 campaigns, Ad sets, and up to 50 Ads per Ad Set.