The taproot of a plant is the main root from which all the other roots grow. It is responsible for all the plant's life processes and any interference in that can slow growth, prevent healing, and sicken the plant.
Just like the taproot of a plant, the human spinal cord is the root from which all the nerves originate and it is responsible for all life processes in the body. Chiropractors detect and remove interference in the nervous system allowing the body to function at a higher level.
Healthy spines produce healthy bodies just like healthy roots produce healthy plants.