Is cannabidiol (CBD) the same thing as marijuana?

No, cannabidiol (CBD) is one of many compounds, known as cannabinoids, found in the cannabis plant. It is not the same as tetrahydrocannabinol (THC), which is the compound that causes the "high" associated with marijuana use. CBD is non-psychoactive and is thought to have therapeutic benefits, while THC is psychoactive and primarily responsible for the intoxicating effects of marijuana.