Prompt: Can you provide a comprehensive guide on how to improve customer retention for both online and offline businesses, including detailed steps, analysis, and best practices? Please cover various strategies and tactics that businesses can use to build customer loyalty, such as creating personalized experiences, providing exceptional customer service, implementing effective loyalty programs, and building emotional connections with customers. Additionally, can you provide examples of successful customer retention strategies implemented by reputable companies, highlighting what made them successful? Can you also discuss how to measure the success of customer retention efforts, and offer guidance on how to make data-driven decisions to optimize customer retention over time?