The binary genders are the two options for gender given in cultures that use the gender binary system of putting all people into gender categories. The binary genders are female (woman, girl) and male (man, boy). For gender expression, the two options are feminine and masculine. Nonbinary genders are those that don't fit into the gender binary system, and don't entirely match one of the binary genders. That said, some nonbinary people identify with one or both of the binary genders, at least in part. Although the gender binary system is coercive and limiting, the binary genders themselves are valid identities. The existence of nonbinary genders doesn't make the binary genders less valid.