Define the term hormone.

Hint: The endocrine system is a chemical messenger system including feedback loops of the hormones delivered by internal glands of organisms straightforwardly into the circulatory system, regulating distant target organs. In humans, the endocrine gland is the thyroid gland and the adrenal gland. In vertebrates, the nerve center is the neural control centre for every single endocrine system. The study of the endocrine framework and its issues is known as endocrinology. Which is a part of internal medicine.

Complete answer:
A hormone is any member from a class of signalling molecule, delivered by glands in multicellular living beings, that are transported by the circulatory framework to target distant organs to manage and regulate the physiology and conduct behaviour.
Hormones are discharged and secreted in the body by a few glands that are essential for the development, growth, improvement, reproduction, generation, and so on. They are the chemical substances which organize the activities of living life forms and furthermore their growth.

They are secreted by special tissues in our body through the endocrine gland.
Various hormones affect the state of the body. A portion of these hormones work rapidly to begin or stop a cycle and some will constantly work throughout a significant stretch of time to play out their capacities. They help in body growth, development, metabolism, digestion, sexual capacity, reproduction and so forth.
Some of the major hormones secreted in the human body are Thyroid hormone, Insulin, Estrogen, Progesterone, Prolactin, Testosterone.

Note: Amino acid-based hormones (amines and peptide or protein hormones) are water-dissolvable and follow up on the outside of target cells by means of second messenger; steroid hormones, being lipid-soluble, travel through the plasma films of target cells (both cytoplasmic and nuclear) to act inside their nuclei.