Gender fluidity refers to a non-fixed gender identity that shifts over time or depending on the situation. It is a form of gender identity or gender expression, rather than a sexual orientation. A person who is gender fluid may identify as male one day, female the next, both male and female, or neither. Gender fluidity may be a transitionary phase, allowing people to explore gender before finding a more stable gender expression or identity. For others, gender fluidity may continue throughout life.

The term "genderqueer" might also be used to describe a person who is fluid. Genderqueer describes someone whose gender identity doesn’t fit within the binary. Other LGBT+ terms for fluid include agender (no gender), bigender (both male and female), demigender (partial connection to a certain gender), or another nonbinary identity. Gender neutral is often a term used to describe people of any gender.

It is important to note that gender fluidity is not a new idea and has been recognized by societies around the world throughout history. Gender diversity is alive and well in every country.