who is a tirthankar vs sidh?

In Jain philosophy, a Tirthankara is a revered spiritual leader who has achieved omniscience (Kevala Jnana) and guides others on the path to liberation. They "ford the river" of worldly existence by establishing the fourfold community of monks, nuns, laymen, and laywomen, thus creating a "tirtha" or ford for others to cross the cycle of birth and death. Tirthankaras are human beings who have conquered inner passions and have shown the path to liberation through their teachings.