The company's 1986 initial public offering (IPO), and subsequent rise in its share price, created three billionaires and an estimated 12,000 millionaires among Microsoft employees. It rose to dominate the personal computer operating system market with MS-DOS in the mid-1980s, followed by Windows. Microsoft was founded by Bill Gates and Paul Allen on April 4, 1975, to develop and sell BASIC interpreters for the Altair 8800. It is one of the Big Five American information technology companies, alongside Alphabet ( Google), Amazon, Apple, and Meta ( Facebook). 21 in the 2020 Fortune 500 rankings of the largest United States corporations by total revenue it was the world's largest software maker by revenue as of 2019.

Its flagship hardware products are the Xbox video game consoles and the Microsoft Surface lineup of touchscreen personal computers.

Microsoft's best-known software products are the Windows line of operating systems, the Microsoft Office suite, and the Internet Explorer and Edge web browsers. Microsoft Corporation is an American multinational technology corporation headquartered in Redmond, Washington, United States.

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