Logistics involves managing the flow of resources from the point of origin to the point of consumption. It includes both physical items like materials and equipment as well as intangible items like information and time. Logistics integrates information flow, materials handling, production, packaging, inventory, transportation, and warehousing. There are two main phases - inbound logistics, which focuses on procuring and transporting materials to plants or warehouses, and outbound logistics, which handles storage and movement of finished products to customers. Key elements of logistics systems include transportation, warehousing, inventory management, packing, and information and communication.