Gender Identity: The personal sense of one's own gender, which can correspond with or differ from the sex assigned at birth.
Gender Roles: The behaviors, tasks, and responsibilities that a society considers appropriate for men, women, and other gender identities.
Gender Expression: The external display of one's gender identity through clothing, behavior, hairstyle, voice, body characteristics, etc., which may or may not conform to socially defined behaviors and characteristics typically associated with being either masculine or feminine.