KPIs (Key Performance Indicators) are measurable values that show how effectively campaigns meet goals. Common KPIs include CTR (click-through rate), conversion rate, bounce rate, and ROAS (return on ad spend). Tools like Google Analytics and Meta Ads Manager help track them.
Example:
A skincare brand runs an ad campaign. They track KPIs like cost per lead, ad impressions, and sales generated to adjust their budget for better performance.