Stock Market Today: The markets ended a volatile trading session on Tuesday with deep cuts as the benchmark Nifty-50 Index ended 1.37% lower at 23,024.65, while Sensex ended 1.6% lower at 75,838.36.

High-frequency stock ... computer-driven stock picking, some exchanges like the NYSE have retained the longstanding practice of using human traders in the trading "pit." During market hours ...

However, the stock market is also open for business before and after regular trading hours for those who want to invest based on a company announcement or new economic data. Trading sessions in ...