Direct answer: Industrial coal tar is coal tar handled as a chemical feedstock or heavy industrial material, usually from coke production or coal-gas processes.
When coal is carbonised to make coke or gas, coal tar can be recovered as a by-product. Industry then separates or processes it into oils, pitch, creosote, naphthalene, and other chemical streams. This made coal tar historically important to dyes, paving, roofing, electrodes, and wood preservation.
Industrial coal tar belongs in coke works, chemical plants, preservative manufacture, carbon materials, and heavy coatings. It is not a general craft tar. Its occupational and environmental controls matter because coal tar and coal-tar pitch exposures are hazardous.
The word industrial is important. It signals scale, regulation, complex composition, and specialist handling. A consumer tin of pine tar and an industrial coal-tar feedstock are not comparable materials.
In short: Produced as a by-product of coal carbonisation. Processed into coal-tar products and chemical feedstocks. Associated with pitch, creosote, and industrial oils. Occupational exposure to coal tar and coal-tar pitch is a recognised cancer risk.