They are the social roles, values, and responsibilities expected of males and females which are defined by society. They are acquired through social interaction and are subject to change over time. They differ from one society to another and from one culture to another.
Those roles are determined based on the culture of a society in terms of religion, social class, ethnicity, method of organization, and its economic needs and not on the biological (gender) differences between males and females, the way society views both genders are shaped. It defines the behaviors and actions that society expects from them.