Behavior refers to the observable response a person makes to any situation. It also includes the reactions or movements made by an individual usually in relation to the environment.

Behavior is controlled by the endocrine system, and the nervous system. Behavior is evaluated relative to social norms and regulated by various means of social control. The person's behavior is studied in human behavior while animal behaviour is studied in comparative psychology, ethology, behavioural ecology and sociobiology.

Other /More definition:
Behavior refers to any activity of an organism that can be observed or somehow measured. It refers to habits, responses, and reactions that can be observed and measured. It is what a person does, how a person acts in response to a stimulus Behavior, moreover means anything that a person does. This implies that the activity is physical and includes obvious, subtle, internal, and private events.

List of books: Behavior