Advertisments, or ads for short, are objects that are advertised on a site. Ads that are not yet advertised are called unfulfilled ads.
Advertisements and objects are not the same thing. Inventory management systems send objects to DV, whilst DV sends advertisements to sites. DV transforms an object into one advertisement per site.
Objects have properties belonging to the specific type of object. For example, cars have properties like make, number of doors, engine power, etc. Advertisements have properties like category, title, description and price. DV maps the object properties to the correct advertisement properties. Some examples:
In some cases, the site only accepts objects and not advertisements. The conversion from an object to an advertisement is then done by the site instead and largely beyond the control of DV. Or, if the party receiving the objects is not a website with advertisements, but for example another inventory management system, no conversion to advertisements is done at all.