Net Promoter Score is a key indicator for measuring customer satisfaction and their willingness to recommend a product or service. It is obtained through a simple question: "On a scale of 0 to 10, how likely are you to recommend this company to a friend or colleague?". Customers who respond with a 9 or 10 are promoters, 7 or 8 are passives, and 0 to 6 are detractors. Analyzing this data helps improve the user experience and detect weak points in customer service.