This document discusses using Net Promoter Score (NPS) to track customer loyalty and satisfaction. NPS measures customers on a scale of 0 to 10 based on how likely they would recommend a company. Scores from 0-6 are detractors, 7-8 are passives, and 9-10 are promoters. The overall NPS is a number from -100 to 100 that indicates customer loyalty. Tracking NPS before and after purchases or service can provide insights. Embedding NPS surveys on websites and measuring loyalty across touchpoints can help improve the customer experience. Companies with high NPS grow faster than competitors.