FCL stands for Full Container Load and are shipments that fill a standard cargo container. Usually these shipments are managed by one logistics company from origin to destination.
In practice, FCL shipments are destined for one consignee and typically travel by ocean freight.
Some companies may prefer to pay for FCL containers even when not utilizing the entire container to avoid unnecessary reloading of palletized goods. It also provides the security that the container is sealed and only opened at the destination port for inspection by customs agents or brokers.