Explain the concept of conversion rate optimization (CRO) and its role in digital marketing.

Conversion Rate Optimization (CRO) focuses on improving the percentage of website visitors who take a desired action, such as making a purchase or filling out a form. CRO involves analyzing user behavior, testing different elements on a website (like headlines, buttons, or forms), and implementing changes to maximize conversions. It plays a crucial role in digital marketing by enhancing the efficiency of marketing efforts and increasing the return on investment.