Wall Street Today, Jan. 27 -- US stocks dropped sharply on Monday, led by technology shares, as surging interest in Chinese startup DeepSeek's low-cost artificial intelligence model raised doubts over the sector's lofty valuations.

The Dow Jones Industrial Average fell 0.27 per cent, to 44,305, the S&P 500 lost 1.72% to 5,996 and the Nasdaq Composite fell around 3% to 19,342. Nvidia , whose chips are the top choice for powering AI applications, dropped nearly 12% in early trading, while industry peers Broadcom and Marvell Technology fell more than 10% each.

The CBOE Volatility Index, known as Wall Street's "fear gauge", hit its highest level since Dec. 20, surging 33% on the day.

What's driving Wall Street down today?

Here are five ke...