It rose to dominate the personal computer operating system market with MS-DOS in the mid-1980s, followed by Microsoft Windows. Microsoft (the word being a portmanteau of ' microcomputer software' ) was founded by Bill Gates and Paul Allen on April 4, 1975, to develop and sell BASIC interpreters for the Altair 8800. information technology industry, along with Amazon, Alphabet ( Google), Apple, and Meta ( Facebook). It is considered one of the Big Five companies in the U.S. 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 2016.

Its flagship hardware products are the Xbox video game consoles and the Microsoft Surface lineup of touchscreen personal computers. Its best-known software products are the Microsoft 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 which produces computer software, consumer electronics, personal computers, and related services.

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