Summary:

• **What happened to tech companies:** Big software companies in the United States lost a lot of money in the stock market because people are worried about artificial intelligence (AI) changing how businesses work. When investors get scared about the future, they sell their stocks, which makes the value go down very quickly.

• **Why people are concerned:** Many people are worried that AI might be able to do jobs that software companies currently do, which could mean these companies make less money in the future. This fear caused investors to sell about $1 trillion worth of stocks in just one week, which is a huge amount of money.