What is CBD?
CBD, or cannabidiol, is a chemical compound from the cannabinoid family that naturally occurs in the cannabis plant. Scientists have isolated 108 different types of cannabinoids in cannabis. 
Delta-9-tetrahydrocannabinol, or THC, is probably the best-known thanks to its psychoactive properties -- it's the one that gets you "high" -- but CBD is quickly gaining ground due to its potential therapeutic benefits. 
How does CBD work?
CBD (and THC) work by interacting with our body's endocannabinoid system, a regulatory system made up of naturally occurring cannabis-like molecules. These endocannabinoids, as they're called, work like neurotransmitters, shuttling messages through the body to help maintain homeostasis. Cannabinoids like CBD and THC interact with the endocannabinoid system at two known receptors: CB1 and CB2.