A Special Trading Session is an extraordinary market session conducted by stock exchanges outside of regular trading hours, typically to test system readiness and business continuity infrastructure. In India, SEBI periodically mandates live trading sessions on Saturdays where NSE and BSE simulate real market conditions to verify that their primary and disaster recovery systems can handle trading seamlessly. These sessions involve brokers, clearing members, and depositories and help the entire market ecosystem stay prepared for unexpected technical disruptions or operational failures during regular market hours.