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That's not entirely true. Anything carried by a plane, boat, truck, car, etc. can be considered cargo. Anything that is carried together is called the shipment.

The term shipping in this context originated from the shipping trade of wind power ships, and has come to refer to the delivery of cargo and parcels of any size above the common mail of letters and postcards.

Cargo comes from the Spanish carger, which means to load

This is a question that has no answer.

So you can ask this question on Y!A.

this boggles me ;p