Customer relationship management (CRM) is the combination of practices, strategies and technologies that companies use to manage and analyze customer interactions and data throughout the customer lifecycle, with the goal of improving customer service relationships and assisting in customer retention and driving sales growth. CRM systems compile customer data across different channels, or points of contact between the customer and the company, which could include the companys website, telephone, direct mail, marketing materials and social media. CRM systems can also give customer-facing staff detailed information on customers personal information, purchase history, buying preferences and concerns.