The Customer Loyalty Index (CLI) is a metric that measures how likely customers are to remain engaged with a brand, make repeat purchases, and recommend the company to others. This index is typically derived from multiple factors, including Net Promoter Score (NPS), purchase frequency, customer satisfaction ratings, and engagement levels. Businesses track CLI in their CRM systems to assess customer retention strategies, predict churn risk, and refine loyalty programs. High CLI scores indicate strong brand relationships, while lower scores may signal potential issues requiring attention, such as poor service or product dissatisfaction. Companies in retail, SaaS, and subscription-based services rely on CLI to enhance customer retention and lifetime value.