The document summarizes the DotCom bubble that occurred in California in the late 1990s. Many internet-related companies, called "DotComs", were established due to the potential of e-commerce. This led to a surge of investment in internet companies. However, many of these companies had questionable business models and commercial potential. The bubble collapsed in 2001-2002, with many DotCom companies going bankrupt and high unemployment in the tech sector. While some companies like Google, eBay and Amazon survived, the collapse significantly impacted the US economy.