Brain stimulation refers to techniques that activate specific areas of the brain to enhance cognitive function or treat neurological disorders. Methods include transcranial magnetic stimulation (TMS), which uses magnetic fields to stimulate nerve cells, and deep brain stimulation (DBS), where electrodes are implanted in the brain to regulate abnormal impulses. These techniques are often used to address conditions like depression, Parkinson's disease, and chronic pain. Research continues to explore their potential benefits, aiming to improve mental health and cognitive abilities while minimizing side effects.