ROAS, or Return on Ad Spend, is a metric used in digital marketing to measure the effectiveness of advertising campaigns. It calculates the revenue generated from a specific ad campaign compared to the amount spent on that campaign. This allows businesses to evaluate the success of their marketing efforts and make informed decisions on future investments. A high ROAS indicates that the campaign is generating a significant return on investment, while a low ROAS may suggest the need for adjustments or a different approach. ROAS is a crucial tool for businesses looking to maximize their advertising budget and achieve a strong return on their marketing efforts.