Windows Internet Explorer (formerly Microsoft Internet Explorer; abbreviated to MSIE or, more commonly, IE), is a series of graphical web browsers developed by Microsoft and included as part of the Microsoft Windows line of operating systems starting in 1995. Internet Explorer uses the Trident layout engine.
The latest release is Internet Explorer 8, which is available as a free update for Windows XP with Service Pack 2 or later, Windows Server 2003 with Service Pack 1 or later, Windows Vista, and Windows Server 2008, and is included with Windows 7 and Windows Server 2008 R2. Versions of Internet Explorer for other operating systems have also been produced, including Internet Explorer Mobile (Windows CE and Windows Mobile), Internet Explorer for Mac (discontinued), and Internet Explorer for UNIX (Solaris and HP-UX).
Internet Explorer 9 is the upcoming version of the current Internet Explorer 8. The beta version is out for download.