If you've ever noticed, websites are slightly different in different browsers. Sometimes a feature on your website that would work in one browser may not work in another. I remember when I first got into webdesign and other browsers (though in existence) were not very well known. Browsers like Firefox were used primarily by very computer savvy people. We were always told, when building your website... use Internet Explorer. Netscape Navigator was also pretty popular then. However, it was all about IE. Now, even though Microsoft has it apart of its software and so it is used in every computer that contains Microsoft, you hardly hear about IE. You hear about Firefox and Chrome the most, but there are others such as Opera, SeaMonkey, and Safari... and that is just to name a few. I wonder if IE is going to go the way of Netscape Navigator and fade away (well it did not fully fade away, but you hardly see or hear about it anymore unless you are client of AOL).