Internet Explorer, abbreviated IE or MSIE, is a proprietary graphical web browser made by Microsoft and included as part of the Microsoft Windows line of operating systems. It has been the most widely-used web browser since 1999.
Though released in 1995 as part of the initial OEM release of Windows 95, Internet Explorer was not included in the first retail, or shrink-wrap, release of Windows 95. The last major upgrade to Internet Explorer, 6.0 SV1, is included in Windows XP Service Pack 2 and Windows Server 2003 Service Pack 1 only. Version 7 of Internet Explorer is currently under development; Beta versions have been released on a regular basis, most recently build 5346.5 released April 24, 2006. Versions of Internet Explorer prior to 6.0 SV1 are also available as a separate download for versions of Windows up to Windows XP. There is a version for Windows CE and Mobile called Pocket Internet Explorer
After the first release for Windows 95, additional versions of Internet Explorer were developed for other operating systems: Internet Explorer for Mac and Internet Explorer for UNIX (the latter for use through the X Window System on Solaris and HP-UX). All of these versions have ceased active development.
Internet Explorer is currently known as Microsoft Internet Explorer, but the name will change to Windows Internet Explorer with the release of Internet Explorer 7.