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- Advertising effectiveness indicators - CTR, CPA, ROI: how to use and interpret correctlyAdvertising plays an important role in promoting products and services, attracting new customers and increasing company profits. To evaluate the effectiveness of advertising campaigns, various indicators are used, among which CTR, CPA and ROI occupy a special place. CTR (Click-Through Rate) is an indicator that reflects the ratio of the number of clicks on an advertisement to the number of impress...