What Is Supply Chain? : A supply chain is a complex logistics system that consists of facilities that convert raw materials into finished products and distribute them to end consumers or end customers. Meanwhile, supply chain management deals with the flow of goods in distribution channels within the supply chain in the most efficient manner 

A typical supply chain can be divided into two stages namely, production and distribution stages. In the production stage, components and semi-finished parts are produced in manufacturing centers. The components are then put together in an assembly plant. The distribution stage consists of central and regional distribution centers that transport products to end-consumers. Mentzer et al. suggest that at least three entities are required for there to be a "supply chain".

At the end of the supply chain, materials and finished products only flow there because of the customer behavior at the end of the chain;[11] arguably that "supply chain processes should be coordinated in order to focus on end customer buying behavior", and look for "customer responsiveness" as an indicator confirming that materials are able to flow "through a sequence of supply chain processes in order to meet end customer buying behavior".

Many of the exchanges encountered in the supply chain take place between varied companies that seek to maximize their revenue within their sphere of interest but may have little or no knowledge or interest in the remaining players in the supply chain. More recently, the loosely coupled, self-organizing network of businesses who cooperate in providing product and service offerings has been called the extended enterprise, and the use of the term "chain" and the linear structure it appears to represent have been criticized as "harder to relate to the way supply networks really operate. A chain is actually a complex and dynamic supply and demand network.

What is Logistics Service ? : 

"All the elements of your supply chain"

Logistics services are all the elements of your supply chain, from the factory to the end customer. They include transportation from manufacturer to warehouse, warehousing and order fulfillment, and delivery to the end customer. A 3PL can facilitate all or some of your logistics as part of your order fulfillment.