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What happened when the dot com bubble burst?
To add to the already existing answers, most of the dotcom companies used an accounting sheningan so profusely that everything looked rosy. To account for revenues, what dotcom companies did was, get into a barter transaction with another dotcom company by selling advertising space and stuff on each other's website. So the final outcome was each had quite a substantial amount of revenue while in reality there wasn't any revenue earned. This cooked up their books to look quite rosy to investors who then poured in their money, without realizing they were pouring money into a black hole. As someone mentioned Cisco, which sells networking gear and was heavily dependent on the dotcom boost. So when everything went bust, its stock price also crashed heavily.  This was for the losers, but some good ones did sail through. Dotcom companies which had substance took a hit, in fact everybody did, during the bust but more than made up for it later on when investors realized they are valuable.