There are three different species of cannabis plants: Cannabis indica, Cannabis sativa, and Cannabis ruderalis. Hemp and marijuana both fall under the species Cannabis sativa, however they are not the same plant. Hemp is defined as Cannabis sativa with less than 0.3% THC and a high concentration of CBD.
Industrial hemp is grown to be durable, as it can also be used to produce fiber. Hemp tends to have very long stalks and fewer flowering buds compared to marijuana. This can make it easier to extract the high amounts of CBD and smaller amounts of THC. Hemp is used to make a number of things — CBD, bricks and hempcrete, grains, fiber, clothing, shoes, and plenty more.