Behavior generally refers to the actions or reactions of an object or organism, usually in relation to the environment or surrounding world of stimuli. Behavior can be conscious or unconscious, overt or covert, and voluntary or involuntary.
The behavior of people (and other organisms or even mechanisms) falls within a range with some behavior being common, some unusual, some acceptable, and some outside acceptable limits. The acceptablity of behavior is evaluated relative to social norms and regulated by various means of social control. The behavior of people is studied by the academic disciplines of psychology, sociology, and anthropology.