Third Party Logistics or 3PL Refers to the outsourcing of activities, ranging from a specific task, such as trucking or marine cargo transport to broader activities serving the whole supply chain such as inventory management, order processing and consulting.
Fourth Party Logistics or 4PL Refers to a party who works on behalf of the client to do contract negotiations and manage of performance of 3PL providers, including the design of the whole supply chain network and control of day-to-day operations.