"Black Tuesday" refers to October 29, 1929, the day the U.S. stock market crashed, marking a significant event in financial history. On this day, investors rushed to sell stocks as prices plummeted, exacerbated by widespread panic and the collapse of major banks. The events of Black Tuesday led to billions of dollars in losses and initiated a prolonged economic downturn known as the Great Depression. The crash revealed deep-seated issues in the economy, such as rampant speculation and banking failures, and prompted significant changes in financial regulation and economic policy in the following decades.