CRM involves identifying, establishing, maintaining, and enhancing relationships with customers through understanding their needs and providing customized experiences. It aims to maximize long-term customer value through collaborative relationships rather than one-time transactions. CRM systems utilize customer data, analytical tools, and customer interactions to improve customer retention and acquire new customers. The key components of a CRM system include operational, analytical, and collaborative CRM, and technology plays an important role in enabling personalized CRM approaches at scale.