Cannabis, also known as marijuana or weed, is a psychoactive drug that comes from the Cannabis plant. It has been used for both recreational and medicinal purposes throughout history. The main active ingredient in cannabis is tetrahydrocannabinol (THC), which binds to cannabinoid receptors in the brain and produces various effects such as euphoria, altered perception of time and space, increased appetite, and relaxation. Cannabis plants produce two primary compounds: THC and cannabidiol (CBD). While THC is responsible for most of the psychoactive effects associated with marijuana use, CBD does not produce these effects but may have potential therapeutic benefits like reducing anxiety or inflammation.