Question

The term gender identity refers to:

Answer 1

Gender identity refers to someones personal experience of one's own gender. It can correlate with the sex assigned at birth, or differ from it completely.

Essentially it's how someone identifies. Some people who were born female identify as male or vise versa.

Answer 2

A person's perception [idea] of having a particular gender, which MAY or MAY NOT match their birth sex. This can happen if they change it after birth.