What is the difference between sex and gender?

A sex is something that you're born as and that is assigned based on chromosomes , while a gender is what you identify as it could be the same as your sex but it can also be different

Sex is what you were assigned as at birth, which is told by your genitals. Gender is how you perceive or identify yourself based on social construction.

The distinction between sex and gender differentiates sex (the anatomy of an individual's reproductive system, and secondary sex characteristics) from gender, which can refer to either social roles based on the sex of the person (gender role) or personal identification of one's own gender based on an internal awareness

Sex is biologically determined: it is masculine or feminine depending on your chromosomes and the genitals you were born with. Gender, on the other hand, is a social construct: it refers to whatever a society expects a man or woman to be and act like. It includes behaviors and habits a man or a woman is supposed to have according to a certain society. There are more than two genders: one can identify with a purely masculine or feminine gender, but also with neither or both in different percentages.

Sex is determined by what's between your legs, while gender is determined by what's between your ears.

Scientifically, you could say sex refers to the gender we are assigned at birth (male/female) due to our reproductive organs, while gender is how you identify personally (man/woman/non-binary/agender/etc)

Sex is biological, determined by genitals, hormones, etc. There are three main sexes: male, female, and intersex (aspects of both binary sexes) Gender is how you see yourself. Transgender, demi-gender, nonbinary, agender, bigender, genderfluid, cisgender, those are all words people use to identify themselves. A lot of those genders have pronouns attached, if someone says they're a trans man, you would probably use he/him, agender: they/them. Genderfluid folx change regularly, demigender people (like myself!) use two sets interchangeably. I am a demigirl, so I use both They/Them and She/Her. I can be introduced as a sister or a sibling, partner or wife, mother or parent. It's all about how you feel.