1. Customer satisfaction, retention, and e-CRM are important for companies to succeed as customer expectations and experiences determine whether they are satisfied. 2. A satisfied customer will remain loyal to the brand, purchase more frequently, and provide positive word-of-mouth marketing, while an unsatisfied customer may stop purchasing and negatively impact the brand. 3. Measuring customer satisfaction involves understanding expectations, perceived performance, and determining if expectations were confirmed, exceeded, or not met to identify satisfied and dissatisfied customers.