Most transgender people are men or women. But some people don’t neatly fit into the categories of “man” or “woman” or “male” or “female.” For example, some people have a gender that blends elements of being a man or a woman, or a gender that is different than either male or female. Some people don’t identify with any gender. Some people’s gender fluctuates over time.
People whose gender is not male or female may use many different terms to describe themselves. One term that some people use is non-binary, which is used because the gender binary refers to the two categories of male and female. Another term that people use is genderqueer. If you’re not sure what term someone uses to describe their gender, you should ask them politely.
It’s important to remember that if someone is transgender, it does not necessarily mean that they have a “third gender.” Most transgender people do have a gender identity that is either male or female, and they should be treated like any other man or woman.