Gender
Although many societies still exist under a gender binary, more and more around the world are becoming more accepting of ideas of gender outside of strict male and female categories. An important thing to know about gender in this form is that the people who exist within them have always existed but have not always been free to express themselves. One example of this is people who are transgender, those who were labeled based on their biological sex, but eventually come to realize that label does not fit what they identify with. In addition to this, some people do not experience gender in a way that fits into a binary at all, and these people are called either non binary or genderqueer.