THC and CBD are two terms you constantly hear when it comes to cannabis, but do you know the difference? THC and CBD are both phytocannabinoids--plant-based compounds that include the active constituents of cannabis. CBD, or cannabidiol, gives the user a physically relaxed feeling without the high, and is often used for wellness purposes. On the other hand, THC (or tetrahydrocannabinol) is the molecule that gets you high. THC is commonly used for recreation and as a mood booster.