Internet Explorer is a web browsing program by The Microsoft Corporation. Microsoft is a company who's Chairman is Bill Gates (William Henry Gates III). Internet Explorer also comes forcefully pre-installed on any Microsoft Windows computer. It is one of the most popular browser because Microsoft Windows is the most popular operating system. There used to be an easily installabe/uninstallable version of this browser for the Apple Macintosh computer, which was discontinued as of version 5.
On Internet Explorer a feature that stands out is compatibillity mode which you can view web pages made for older or different browsers (Only on Internet Explorer 7 and up.)