What does it mean to be ‘cisgender’?

Cisgender (cissexual, or to simply cis) is a term for people whose gender identity matches the sex that they were assigned at birth. Someone who identifies as a woman and was assigned female at birth is, for example, a cisgender woman. “Cisgender” was introduced so our language could be more fair and inclusive, and to make us more aware of everybody’s experiences of gender. However, the term has critics as well as fans.