Final answer:
A chiropractor specializes in the manual adjustment of joints, particularly the spine, to maintain and restore health, using techniques such as spinal manipulation without surgery.
Step-by-step explanation:
The individual who focuses on the manual adjustment of joints, especially the spine, for health maintenance and restoration is a chiropractor. Chiropractors use drug-free, hands-on approaches such as spinal manipulation to treat their patients. They are adept at diagnosing various conditions through physical exams, assessing their patient's posture, and may use additional tests like X-ray images to aid in their diagnoses. Aside from manual adjustments, chiropractors may also prescribe therapeutic exercises, and some even integrate acupuncture, massage therapy, or ultrasound in their treatment programs. These healthcare professionals cover a range of specializations from sports injuries and neurology to nutrition and pediatrics.