CBD, short for cannabidiol, is a chemical compound from the Cannabid sativa plant, whish is also known as marijuana or help, according to the US National Library of Medicine. It's a naturally occurring substance that's used in products like oils and edibles to impart a feeling of relaxation and calm. Unlike its cousin, delta-9-tetrahydrocannabinol (THC), which is the major active ingredient in marijuana, CBD is not psychoactive.