The Net Promoter Score (NPS) is a metric used to gauge customer satisfaction and loyalty. It is calculated by asking customers how likely they are to recommend a company's products or services on a scale of 0 to 10, and then subtracting the percentage of detractors from the percentage of promoters. NPS can be used to benchmark a company's performance against its competitors, or track changes in customer satisfaction over time. It is also sometimes used as a predictor of business growth.