What is a reflex? what are the reflexes?

A reflex is a reaction of an animal organism that has a nervous system to external stimuli of the central nervous system. The path through which the response to the pathogen is transmitted is called the reflex arc.
Reflexes are divided into two types:
1) Unconditioned are reflexes that are transmitted hereditarily, that is, congenital. They perform a protective role, as well as a function of adaptation to the environment. For example, the immediate withdrawal of the hand from a hot or sharp object is a protective reaction of the body, that is, a reflex.
2) Conditioned are reflexes acquired in the process of life. For example, when we see a cut lemon with juice flowing, profuse salivation begins, this process is called a conditioned reflex.