Autonomic nervous system is a fundamental division of the peripheral nervous system that controls and regulates involuntary physiological processes essential for maintaining homeostasis. This concept investigates the neural mechanisms governing vital functions such as heart rate, digestion, respiration, and glandular activity, operating largely outside conscious control and comprising sympathetic, parasympathetic, and enteric components. Its significance lies in enabling adaptive responses to environmental changes and internal demands, crucial for overall organismic survival and stability.