Jainism is considered an eternal religion in Jain philosophy, meaning it has no beginning and no end.

In the present time cycle, Jain tradition says it is revived and taught by the 24 Tirthankaras.

• Lord Rishabhanatha (Adinath) is regarded as the first Tirthankara of this era.
• Lord Mahavira is the 24th and last Tirthankara of this era.

Historically, Jainism became widely known through the teachings of Lord Mahavira, who lived in ancient India and re-established the path of ahimsa, self-discipline, truth, and liberation.

So, in simple words:

• Spiritually: Jainism is eternal.
• Historically: it is associated with the teachings of the 24 Tirthankaras, especially Rishabhanatha and Mahavira.