Segmentation is the practice of dividing your email list into smaller groups based on specific criteria such as demographics, purchase history, or behavior. Effective segmentation allows you to: 1. Targeted Campaigns: Send more relevant emails to specific groups, increasing engagement and conversions. 2. Personalized Content: Tailor your messages to meet the specific needs and preferences of different segments. 3. Improved Metrics: Segmented campaigns typically see higher open rates, CTRs, and conversion rates.