Email marketing segmentation is a powerful tool to increase personalization, engagement, and conversions by dividing recipients into targeted groups based on interests, behaviors, or demographics. By using segmentation, businesses can craft content that resonates with specific groups, increasing open rates, click-through rates, conversion rates, and ROI. Demographic, behavioral, lifecycle stage, and other types of segmentation can be used to tailor emails to individual customers, such as loyalty programs, new customer onboarding, or product recommendations. With the right tool and data analysis, businesses can automate segmentation, measure results, and adjust campaigns for better performance.