The term gender identity describes a person's own individual experience of their gender. It is typically a person's private perception of what it means to be a man or a woman, and is not dependent on cultural expectations or norms. In most cases, a person's biological sex matches their gender identity. However, some cultures recognize a third gender category for anyone who does not identify with their biological sex. This category encompasses transgender and transsexual people, who may identity with the sex opposite to their biological sex, as well as people who identify with both or neither sex.