A Campaign is a framework used to distribute your ads to your audience. Display Ads are held within an Ad Set, which define how they are distributed and to which audience. There can be many Ad Sets per Campaign and many Ads per Ad Set, but you only need one of each to get started.
Creating a Campaign in Criteo will take a few steps:
Step 1: Set up Campaign name, goal and spend limit
Step 2: Build an Ad Set
Step 3: Create an Ad
Step 4: Review your setup