The dot-com bubble was a stock market bubble that popped to near-devastating effect in 2001. It was powered by the rise of Internet sites and the tech industry in general, and many of these companies went under or learned some valuable lessons when the bubble finally burst. Many investors lost substantial sums of money, helping to trigger a mild economic recession in the early 2000s. Analysts noted that some companies did not seem to be sobered by the burst of the bubble when web 2.0 sparked a fresh round of investing and speculation around 2004.