Woman is a gender identity which is seen as part of the gender binary. Woman is a term used for adults, and corresponds to the terms girl (for children and adolescents), female (adjective) and femininity.
Children born with vulvas are often raised with the expectation that they will identify as women, although intersex children may also be assigned to this identity while not possessing all of the above characteristics. Women may be cisgender (assigned female or sometimes intersex at birth and identifying as women), transgender (assigned male or sometimes intersex at birth and identifying as women), or non-binary (assigned any sex at birth, and identifying as women but not entirely).
Identifying as a woman is often associated with female sex characteristics such as a vagina, a vulva, a uterus, wide hips, breasts and a high-pitched voice, as well as a feminine gender expression and gender role, but these are not neccessary, and it is still possible to identify as a woman without them.