what exactly is the ECS?

the Endocannabinoid system (ECS) is a web of communication, by way of the nervous system, through which our bodies maintain an internal state of balance, also known as homeostasis. The ECS is made of endocannabinoids (neurotransmitters, like serotonin and dopamine), the receptors targeted by the endocannabinoids, and the enzymes that break down the endocannabinoids. FYI that's mad cool.