A cis woman is a woman whose gender identity corresponds to the sex they were assigned at birth. In other words, a cis woman is someone who identifies as a woman and was assigned female at birth. The term "cis" is used to describe people whose gender identity matches the sex they were assigned at birth. It is important to use the term "cis" to avoid using words like "normal" or "regular" that can position trans people as "abnormal" or "irregular".