The main role of the endocrine system is to regulate various bodily functions through the release of hormones. These hormones serve as chemical messengers that help control processes such as growth, metabolism, reproduction, and mood. The endocrine system includes glands like the pituitary, thyroid, and adrenal glands, each producing specific hormones that interact with target organs and tissues to maintain homeostasis. Proper endocrine function is vital for overall health and well-being.