Fascia is a thin Layer of Connective tissue that lies under the skin and wraps every muscle and organ in the body. If you've ever pulled up the skin on raw chicken or steak, and seen that thin, white and filmy layer of tissue, that's fascia.
Fascia is like thin, saran wrap-like layer that wraps around the entire body--individual muscle and organ and also connects the muscles to the bones. Fascia is key to the structural integrity of our bodies. Fascia is also where the nerves and lymph nodes lie so healthy fascia is related to a healthy immune system. Fascia used to be considered un-important, but recently got labeled as a sensory organ, as this is where pain originates and is communicated to the brain. Western medicine has only recently begun to really recognize the role of fascia in the body, and terms like "myofascial release" are now buzzwords in the fitness industry.