Third-Party Logistics (3PL) and Fourth-Party Logistics (4PL) are both types of logistics providers, but they differ in the services they offer and the role they play in the supply chain.

3PL is a type of logistics provider that offers a range of services such as warehousing, transportation, and distribution. 3PL providers typically handle specific logistics functions on behalf of their clients, and may operate their own warehouses and transportation fleet. They are often engaged by companies to outsource logistics functions that are not core to their business.

4PL, on the other hand, is a more strategic and integrated type of logistics provider. A 4PL provider acts as a lead logistics provider (LLP) and takes a more holistic and strategic approach to managing the supply chain. They typically work with a network of logistics service providers, including 3PLs, to create a customized logistics solution for their clients. 4PL providers also take a more active role in managing and coordinating the logistics service providers in their network, and are responsible for overall supply chain performance and results.

In summary, 3PL is a logistics provider that offers a range of logistics services such as warehousing, transportation, and distribution, while 4PL is a more strategic, integrated and lead logistics provider that takes a holistic approach to managing the supply chain and coordinates a network of logistics service providers to create a customized logistics solution for their clients. 4PL providers are more focused on overall supply chain performance and results, while 3PL providers are focused on providing specific logistics services.