Net Promoter Score, or NPS, is a widely used metric that measures customer loyalty and satisfaction. It is based on a single question: "On a scale of 0 to 10, how likely are you to recommend our product or service to a friend or colleague?" Respondents are categorized into three groups: Promoters (scores 9-10), Passives (scores 7-8), and Detractors (scores 0-6). To calculate the NPS, subtract the percentage of Detractors from the percentage of Promoters. The resulting score can range from -100 to +100. A higher NPS indicates a more loyal customer base, which can lead to increased growth and profitability for businesses.