Customer segmentation is the practice of dividing a customer base into smaller groups based on shared characteristics such as demographics, behavior, interests, or purchasing habits. This process allows businesses to tailor marketing messages, personalize customer interactions, and improve conversion rates. Segmentation can be behavioral (purchase history, engagement level), demographic (age, gender, income), geographic (location-based marketing), or psychographic (lifestyle, values). CRMs facilitate segmentation by analyzing data and enabling automated targeting strategies. Effective segmentation leads to improved customer engagement, higher sales, and enhanced marketing ROI.