Stock Market Today: Dow Sinks 800 Points, Ciena Slammed As These Oil Stocks, AI Chip Firm Rally (Live Coverage)

The Dow's significant 800-point drop signals broad market anxiety, likely driven by inflation concerns or impending interest rate decisions, weighing heavily on sectors like technology, as evidenced by Ciena's decline. However, a rally in oil stocks suggests resilience amid energy demand or supply dynamics, while a surge in AI chip firms highlights continued investor confidence in artificial intelligence despite the broader market downturn. Investors should watch for further macroeconomic data and sector-specific performance divergence.