Customer service is the provision of service to customers before, during, and after a purchase. Good customer service relies on principles like greeting customers, understanding their needs, explaining products and services, suggesting additional items, and thanking customers. Customer service is important because 68% of customers will leave due to bad service. Providing good customer service leads to benefits like satisfied and loyal customers, lower costs to attract new customers, competitive advantages, and personal and organizational benefits like increased job satisfaction and a motivated workforce. Customer service is a key factor in the growth and success of industries in India like retail, hospitality, and telecommunications.