The Dot Com Bubble was a period in the late 1990s and early 2000s when internet-based companies saw their stock prices soar to unsustainable levels. Investors were overly optimistic about the potential of the internet, leading to excessive speculation and investment in tech startups, many of which had little to no profit. As a result, the bubble burst in 2000, causing a significant market crash. Many companies, including well-known names like Pets.com, went bankrupt, and billions of dollars in investments were lost. This event highlighted the risks of speculative investing and led to more cautious approaches in the tech industry.