Gender refers to the characteristics, behaviours, traits and social roles that people attribute to men or women. Unlike ‘Biological Sex’ which refers to the genetic and anatomical difference between males and females, gender is socially constructed and thus may differ amongst cultures or geographies and can change over time. 

Socially constructed means that the society (or grouping) has a mutual, often unspoken understanding of certain beliefs, concepts or ideas regarding the relations between men and women in society. Gender is socially constructed because the way we think about what it means to be a man or woman and the way we define masculinity and femininity are changeable and can differ depending on your culture, religious beliefs or simply change over time.