Click-Through Rate (CTR): The ratio of clicks on an ad to the number of times it is shown. Conversion Rate: The percentage of users who take a desired action, such as making a purchase or signing up for a newsletter. Return on Investment (ROI): The revenue generated from the campaign compared to the cost of running it. Customer Acquisition Cost (CAC): The cost of acquiring a new customer through the advertising campaign. Engagement Rate: The level of interaction (likes, shares, comments) that an ad receives on social media platforms.