The endocannabinoid system is spread throughout your brain and body, but primarily throughout your central nervous system. The interaction between cannabinoids and receptors is what produces effects like the regulation of mood, pain, appetite, inflammation, and memory. Plant-based cannabinoids, found in cannabis plants, also interact with the receptors (whimsically named CB1 and CB2) in the endocannabinoid system, and each affects your body in different ways. CBD and its infamous cousin THC are the 2 most well-known cannabinoids.
Both varieties contain CBD and THC (albeit at different levels), which are the two primary compounds in the Cannabis sativa plant. The Cannabis plant is also very diverse, as it can grow in many different forms. The most common types are Sativa and Indica, but there are more, with each type having dozens – if not hundreds – of different adaptations and different ratios of active compounds, also known as cannabinoids.