The document compares three key metrics for measuring customer satisfaction: Customer Satisfaction Score (CSAT), Customer Effort Score (CES), and Net Promoter Score (NPS). CSAT assesses satisfaction with specific interactions, CES evaluates the effort required to engage with a company, and NPS indicates a customer's likelihood to recommend the company. The document emphasizes the importance of using these metrics in combination to enhance customer satisfaction and provides insights on their applications and limitations.