Browser Compatibility-If you are trying to use tables to control the appearance of your web site, you may be able to achieve the exact look you want on a single browser (such as Internet Explorer). However, when people visit your web site with browsers like Firefox, Opera or Safari, your layout may be completely broken. If you want to make sure that users from any browser get the best experience from your web site, you need to start using CSS. Although it's not perfect, CSS will ensure that visitors don't leave your web site because of a broken layout.
Easier to Update-Wouldn't it be nice to change the font color with a single line of code? With CSS, it really is this simple. Although updating the appearance of a large web site that only uses HTML can take days or weeks, CSS keeps all your style information on a single page.
Faster Load Times-By using an external .CSS file, you can significantly reduce the load time of every page on your web site. This is because a browser can cache all of the style information for your pages instead of needing to load every tag over and over again.
More Attractive Pages-This is probably the most obvious advantage of CSS. CSS can accomplish things that a HTML only web page could never even come close to doing. CSS really does give you complete control over how you want your web site to look. An well-designed web site will always be perceived as more reliable than one that does not look professional.
