A woman is a female human. The term woman is usually reserved for an adult, with the term girl being the usual term for a female child or adolescent. However, the term woman is also sometimes used to identify a female human, regardless of age, as in phrases such as "women's rights". "Woman" may also refer to a person's gender instead of their sex. Women are typically capable of giving birth from puberty until menopause, although some sterile, intersex and/or transgender women cannot. Throughout history women have assumed or been assigned various social roles.