Is there a difference between a commercial truck, an 18-wheeler and a big rig?

When we use the term “commercial truck”, we’re talking about trucks that are larger than the standard pickup seen on the road. Those driving them must hold a commercial driver’s license, and they are used to haul various commercial goods across the nation and across Texas. All big rigs and 18-wheelers are commercial trucks, but there are other types of commercial trucks as well. Other examples include tanker trucks, large freight trucks, cement trucks, tractor-trailers and delivery vehicles.