Gender is a complicated thing – in most societies, there is a basic division between gender attributes assigned to males and females. Gender can correlate with someones biological sex (cisgender) or differ from it (trans) – and one’s gender expression can also differ or conform to whatever gender you identify as. But what’s the difference?
Let’s start with gender identity. Gender identity is the sense of one’s own gender – so it ecompasses terms such as transgender, nonbinary, cisgender etc. But gender expression is a bit more complex than gender identity – gender expression refers to a person’s gender identity, but this is not always the case (e.g. my gender identity is nonbinary, but I express myself in a typically masculine way, while someone with the same gender identity may dress in a typically feminine way).