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Gender diversity has existed throughout history and across cultures. The concept is based on a distinction between sex (the physical characteristics that identify individuals as male or female) and gender (an individual’s sense of being a man or a woman, or a combination of these). Gender-diverse people define themselves, and behave, in ways that are not expected of people with their biological sex. They are often described as ‘transgender’ or ‘trans’. Transgender people may be heterosexual, bisexual or homosexual.

There are many theories but no single explanation as to why transgender people do not fit within the ‘normal’ categories of sex and gender. Most of these people feel their gender identity is not something they can control, but an expression of their true selves.

Read more here :http://www.teara.govt.nz/en/gender-diversity/page-1