Windows 98 (codenamed Memphis) is a graphical operating system by Microsoft. It was released to manufacturing on 15 May 1998 and to retail on 25 June 1998. Windows 98 is the successor to Windows 95. Like its predecessor, it is a hybrid 16-bit/32-bit monolithic product with an MS-DOS based boot loader.

On May 5 1999 Microsoft released an updated
version, which is called Windows 98 Second Edition (often shortened to SE). It includes fixes for many minor issues, improved USB support, and the replacement of Internet Explorer 4.0 with Internet Explorer 5.0.

Windows 98 was succeeded by Windows Me on 14 September 2000. Microsoft support for Windows 98 ended on 11 July 2006.