At the forefront of modern neuroscience, stereotactic and functional neurosurgery are pioneering disciplines offering innovative approaches to address various neurological and psychiatric conditions. Utilizing advanced imaging techniques and precise targeting methods, these fields navigate the intricate landscape of the brain with unparalleled accuracy. Stereotactic neurosurgery employs meticulous three-dimensional coordinate calculations to pinpoint specific brain targets, facilitating minimally invasive procedures such as biopsies, lesion ablations, and deep brain stimulation (DBS). DBS, a hallmark of this field, has transformed the management of movement disorders like Parkinson's disease and essential tremor, as well as psychiatric conditions such as obsessive-compulsive disorder (OCD) and major depression. Through the implantation of electrodes into precise brain regions, DBS modulates neural circuitry, providing relief from debilitating symptoms and significantly enhancing patients' quality of life. In contrast, functional neurosurgery delves deeper into neural circuits, aiming to modulate brain activity to alleviate symptoms associated with neurological and psychiatric diseases. Techniques like DBS serve as a potent tool, offering targeted neuromodulation by delivering controlled electrical impulses to specific brain regions. This approach effectively regulates abnormal neural activity, offering relief from symptoms such as tremors, rigidity, dyskinesias, mood disturbances, and cognitive impairments associated with various conditions.