What is „gendern“ in German?

What does "gendern" or "geschlechtergerechte Sprache" mean? Why should we do that? to promote equality to stop discrimination/invisibility of certain groups to stop reproduction of stereotypical role models (der Arzt – die Krankenschwester vs. die Ärztin – der Krankenpfleger) to promote an inclusive language What is the idea behind it? The idea is that