Chakra comes from the Sanskrit language and refers to enegy vortexes or wheels within the body. I read a long time ago that there are hundreds of such wheels within the body. However, most often you hear about the 7 or eight that ascend the spine from the tailbone, up into the throat and third eye and above the head.
Different colors, sounds, parts of the body and energies are associated with each Chakra. The root chakra is located in the tailbone area. Red is its color. Lam is the sound. It represents earthy things, survival, the tribe, instincts, grounding, health, prosperity and security.
The Kundalini energy also resides in the tailbone. Kundalini energy is often symbolized by a snake. The snake/fire energy awakens (often during yoga asanas) and this powerful energy rises up the spine awakening latent energies. In the best case scenario our chakras are in balance. When out of balance we feel various dis-eases in our body. There are many layers of understandings about the Chakras. This is a simplistic description. Also, I am using my own words and understandings and am not an expert. To read more click here. This is but one of many sites about Chakras.