It’s an organization, individual or group of people in charge of ensuring that shipments arrive on time and to the correct destination mostly in the international freight. They are also called Freight forwarders
These companies, are typically, the go-between the shipper and the forwarder company and provide their service when the forwarder cannot complete the service required. Being the link, they must have units available to provide the service to the truck company on time.
Freight brokers essentially play the role of a broker and ensure shipments happen smoothly across the entire supply chain, across multiple players
The kind of players that are involved in the freight brokers are carriers that they work with, US customs and border protection, agencies, domestic transportations (DHL, FEDEX) and they work with the rail companies for intermodal transportation and their warehouses as well.