CBD, short for cannabidiol, is a natural compound found in the Cannabis Sativa plant, specifically in the flower's resinous buds.
Cannabis is perhaps more well-known for THC (tetrahydrocannabinol), the compound that causes the intoxicating "high" effect.
However, unlike THC, CBD does not have psychoactive properties, meaning it won't make you feel "high". Instead, it has been gaining interest for its potential with therapeutic benefits.