The primary role of Hera in Greek mythology is as the goddess of marriage and family, alongside being the queen of the gods. She is married to Zeus and is known for her protective nature over women in marriages. Hera often reacts strongly against infidelity, particularly Zeus's numerous affairs, and is depicted as vengeful towards those who threaten her family's honor. Her role emphasizes the importance of marital fidelity and the trials within divine and mortal relationships.