Microsoft is the leading platform and productivity company for the mobile-first, cloud-first world, and its mission is to empower every person and every organization on the planet to achieve more.Its best known software products are the Microsoft Windows line of operating systems, Microsoft Office office suite, and Internet Explorer web browser. Its flagship hardware products are Xbox game console and the Microsoft Surface series of tablets. It is the world's largest software maker measured by revenues. Microsoft was founded by Bill Gates and Paul Allen on April 4, 1975 to develop and sell BASIC interpreters for Altair 8800. It rose to dominate the personal computer operating system market with MS-DOS in the mid-1980s, followed by the Microsoft Windows. The company also produces a wide range of other software for desktops and servers, and is active in areas including Internet search, the video game industry, the digital services market, and mobile phones.