24 October 1929 is known as Black Thursday, when panic selling intensified on the New York Stock Exchange.
The Dow Jones Industrial Average fell sharply that day as trading volume reached a then-record level. Major bankers attempted to restore confidence by buying leading stocks, but the temporary rally did not end the wider panic. Selling became even more severe on 28 October, known as Black Monday, and 29 October, known as Black Tuesday.
The 1929 crash followed a long period of rising share prices, extensive speculation, and widespread use of borrowed money to buy stocks. The crash did not by itself cause every aspect of the Great Depression, but it damaged confidence and helped deepen the economic downturn.
A common mix-up is treating Black Thursday as the single day the market reached its lowest point. The most dramatic losses came several trading days later, especially on Black Tuesday.