The vagus nerve is a crucial part of the autonomic nervous system, responsible for regulating many involuntary bodily functions. It extends from the brainstem to various organs, including the heart, lungs, and digestive tract. This nerve plays a key role in controlling heart rate, digestion, and respiratory rate, helping maintain homeostasis in the body. Additionally, the vagus nerve is involved in the body's stress response. It helps activate the parasympathetic nervous system, which promotes relaxation and recovery after stress. Stimulation of the vagus nerve can enhance mood and reduce anxiety, making it an important focus in both medical and wellness practices.