The Dot-Com Bubble was a period in the late 1990s and early 2000s when internet-based companies saw their stock prices soar to unrealistic levels. Investors were excited about the potential of the internet, leading to massive investments in tech startups, many of which had little to no profit. This frenzy created a bubble, where the value of these companies was inflated beyond their actual worth. When the bubble burst in 2000, many of these companies collapsed, leading to significant financial losses for investors. The aftermath taught valuable lessons about the importance of sustainable business models and cautious investing in the technology sector.