Question

what is a hormone pls tell me

Answer 1

A hormone is a substance used by the body to communicate chemically

Answer 2

These are chemicals messengers and are produced by glands.
Hormones are chemical substances that affect the activity of another part of the body (target site). In essence,hormones serve as messengers, controlling and coordinating activities throughout the body.
There are many types of hormones like GH which is secreted by pitutary gland it regulates the growth. etc