Stocks gave up earlier gains Friday as the White House reaffirmed President Donald Trump’s plan to implement some of his long-promised tariffs Saturday, with the market closing out a whirlwind week highlighted by Nvidia’s record-breaking losses in reaction to China’s DeepSeek cheaper AI model and a flurry of earnings reports.

Here’s what you need to know about DeepSeek, the Chinese AI startup that rattled markets as its app dethroned OpenAI's as the most-downloaded free app in the U.S. on Apple.

Global investors are worried the emergence of a low-cost Chinese AI model will threaten the dominance of AI leaders.