Logistics involves the movement of materials, services, cash, and information through a supply chain. This includes inbound and outbound transportation, warehousing, inventory management, and distribution planning. Third-party logistics providers can also help manage logistics functions. Reverse logistics deals with returns and proper disposal of goods. E-business uses internet technologies to facilitate transactions and improve supply chain visibility, communication, and event management. Radio frequency identification (RFID) uses radio waves to identify and track goods in supply chains.