Competitors include Firefox, Opera, and Google Chrome, but they all take up way too much memory, and have a bunch of useless "add-ons" that you have to install just to do basic stuff such as block popups. These addons frequently cause browser crashes, and become outdated whenever the browser updates. IE8 comes with all of these features from the start, and the addons it has never cause problems. Internet Explorer can also view 99% of all websites with no problem, while these other guys are incompatible with half of the websites out there.
Some douches out there will dis Internet Explorer, but usually these guys are just butthurt Mac fans who are jealous of Microsoft's popularity - so don't listen to them, Internet Explorer is the best.
Smart IE8 user: Wow, grow a brain idiot. Don't be jealous just 'cause you got suckered into buying a Mac and got stuck with Firefux as your default browser. Internet Explorer kicks ass.
The only reason you should ever use Internet Explorer.
The sole purpose of IE
The best part about Internet Explorer is that it forced companies, such as Mozilla and Opera, to make their own browsers, which completely and utterly blow Internet Explorer out of the water.
Download Opera/Mozilla plz.
IE is buggy, has many security holes, is slow, supports ActiveX so websites can install their XXX dialers on our systems, and finally, it's not standards compliant, so 80%+ web pages have sloppy HTML which doesn't work with standards compliant browsers, only IE. How convenient.