Chiropractors are independent health care professionals who treat many conditions as they relate to the spine, emphasizing the dependency of health on the correct functioning of the central nerve system.
Chiropractors adjust or manipulate misaligned vertebrae (the bones of your spinal column) to restore correct functioning of your central nerve system. They may also work with other parts of your body affected by the misaligned vertebrae. Chiropractors may do this by using their hands and various mechanical and electrical instruments. "D.C." stands for "Doctor of Chiropractic," the degree New York licensed chiropractors must earn.
For more information you may visit http://www.op.nysed.gov/prof/chiro/chirobroch.htm.