CBD is one of many compounds, known as cannabinoids, in the cannabis plant. Until recently, the best-known compound in cannabis was delta-9 tetrahydrocannabinol (THC), the most active ingredient in marijuana.
Marijuana contains both THC and CBD, and these compounds have different effects.
THC creates a mind-altering "high" when a person smokes it or uses it in cooking. This is because THC breaks down when we apply heat and introduce it into the body.
CBD is different. Unlike THC, it is not psychoactive. This means that CBD does not change a person's state of mind when they use it.