Neurotransmitters play a pivotal role in mood regulation by facilitating communication between neurons in the brain. These chemical messengers, such as serotonin, dopamine, and norepinephrine, influence various psychological and physiological processes. For instance, serotonin is often linked to feelings of happiness and well-being, while dopamine is associated with reward and motivation. An imbalance in neurotransmitter levels can lead to mood disorders, such as depression or anxiety. Therefore, understanding the functions of these neurotransmitters is essential for developing effective treatments for mental health conditions.