Nvidia has lost $1 trillion in value as the demand for its AI-related products appears to be slowing down. This decline is part of a broader trend that has affected the US stock market, with some reports suggesting that a significant amount of value has been wiped off US stocks. The cause of this downturn is unclear, with various factors such as weak jobs data, the unveiling of a Chinese AI chatbot, and a decline in tech stocks all being reported.