What is Ad set? Ad group explained
An ad set is the level of a Meta campaign that holds targeting, placements, schedule, and (with ABO) budget; Google calls the equivalent an ad group.
Example
A campaign for a summer sale might have one ad set targeting past buyers and another targeting a lookalike audience.
Why does Ad set matter for e-commerce?
Structuring ad sets by audience or test cell keeps results comparable and makes it clear where budget is working.
How does Posta use Ad set?
Posta's agents use Ad set when reviewing your accounts and recommending changes. See the AI Meta ads management page for how it fits into your workflow.