Cannabidiol (CBD) is a naturally occurring compound found in cannabis plants, first identified in 1940. It is one of over 100 cannabinoids in cannabis and can make up to 40% of the plant's extract.

CBD can be consumed in various ways, including inhalation through smoke or vapor, oral ingestion, and as a spray. It is available in forms such as CBD oil, capsules, dried cannabis, and liquid solutions. Unlike THC, CBD is non-psychoactive and can influence the effects of THC when both are present.