Supply chain management, logistics, and physical distribution include three distinct groups of business functions. Sometimes the definitions vary by industrial sector, or the military/service sector of the economy, but a quick, simple definition is as follows:
Physical distribution (as opposed to marketing or sales channels of distribution)includes the business functions of warehousing and outbound transportation/traffic to customers
Logistics includes physical distribution functions, and adds: inbound transportation/traffic; customer service; finished goods inventory management
Supply chain includes logistics processes and functions, plus purchasing/buying/procurement, manufacturing, the information systems both internal and external with customers and suppliers/vendors, sales order processing information systems