Here is a simple, authentic Jain understanding.

1) What “Satī” means in Jain Dharma

• In Jainism, satī means a supremely virtuous woman. Her core virtues are faith in the Tirthankaras (samyaktva), truthfulness, non‑violence, chastity/celibacy according to stage of life, forgiveness, austerity, and detachment.
• It does NOT mean widow