Here's what you need to know about DeepSeek, the artificial-intelligence phenomenon that is roiling global technology stocks. **What is DeepSeek?
China's DeepSeek artificial intelligence (AI) start-up has rattled investors in U.S. stocks with an AI data center link.
The S&P 500 and Nasdaq are dropping, while the Dow ekes out a gain as tech stocks fall amid fears over China's DeepSeek AI.