What is an ad set?
In a campaign, ad sets are groups of ads that share targeting, scheduling and placement settings. Ad sets make it easier to manage large campaigns because you can group ads together and edit this information just once, rather than defining it for each ad separately.
Budgets can be set either on the campaign or ad set level. If the campaign as a whole has a budget, use the ad set level to fine-tune where and how to spend it.
To find out how to create ad sets, click the links below.