Dot-com is a term used to describe Internet websites ending with the domain suffix .com. Its widespread use was popularized in 1995 during the dot-com boom, when companies and individuals began to register large numbers of .com domains on the Internet.
Between 1995 and 2001, the Internet experienced what is now referred to as the dot-com bubble. During the dot-com bubble dot-com companies were making enormous amounts of money from stocks and investments until the bubble began to burst in 2000 taking companies with it.
Since the dot-com bust the Internet and companies that survived have fully recovered. Today, many people believe with so many new Internet companies going public and other Internet companies being sold for billions of dollars that we may be in another Internet bubble.