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.

Headquartered at the Microsoft campus in Redmond, Washington, 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 producing computer software, consumer electronics, personal computers, and related services.

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