CPC (Cost Per Click) refers to the amount advertisers pay for each click on their ads, while CPA (Cost Per Acquisition) measures the cost of gaining a conversion or customer action. CPM (Cost Per Mille) represents the cost for every 1,000 ad impressions and is commonly used for brand awareness campaigns.
ROAS (Return on Ad Spend) measures the revenue earned compared to the advertising cost, making it especially important for e-commerce and sales-focused campaigns. The right metric depends on your campaign goals, whether they focus on traffic, lead generation, conversions, sales, or brand visibility.