Gender identity is the subjective and internal sense of being a man, a woman, both, neither, or somewhere else along the gender spectrum; it is the deeply felt psychological identification as male, female, or another gender. This is distinct from sex assigned at birth, which is typically based on visible biological characteristics, and gender expression, which is how an individual outwardly presents their gender through clothing, behaviour, and other means. Gender identity is a fundamental aspect of an individual's sense of self and can align with or differ from their sex assigned at birth. The development of gender identity is a complex process influenced by biological, psychological, and social factors. For many individuals, their gender identity is a core part of who they are and how they experience the world.