Conversion Rate Optimization (CRO) is a method for improving the percentage of website visitors who take specific actions, such as filling out a form or completing a purchase. CRO involves analyzing website user behavior, identifying potential bottlenecks, and implementing changes to layout, copy, or design. Tools like A/B testing, heat maps, and user feedback are essential for CRO. 
It’s an effective tactic in digital marketing because it increases ROI without the need to drive more traffic. Successful CRO strategies enhance the user experience, drive more conversions, and improve customer satisfaction.