Industrial hemp is another word for hemp plants that contain little to no active THC. This term differentiates hemp from the plants used to make marijuana products. The term industrial refers to the historical use of hemp plants. They were used as a source of building materials and textiles in the early and mid-1900s. Industrial hemp plants grew much taller and faster than marijuana plants. They were a rich source of fiber used to make clothing and ropes. During every major war in the United States and Europe, hemp plants served as a staple manufacturing material and were in high demand. Today, industrial hemp is still used for its fiber, but many companies also use it to make CBD extracts.