As a web developer, all information in your web site should go into your HTML files, but HTML files should not contain information about how that information is displayed. All information about how the pages should appears goes to CSS file.
The traditional HTML approach was to "hardcode" all the appearance information about a page. Developers have to create a lot of pages to fill in these codes. And this will need a lot of editing, and a lot of re-editing if developers decide to modify the appearance of pages later. And all of that editing will most probaly have plenty of errors.
With CSS, developers can decide how information should appears by entering the information once. Example such as the header. Every header in every page that is linked to the CSS now has that appearance. This saves time and reduces the percentage of making errors.
Another major advantage involves the management of large, sophisticated sites. With CSS, whole organization can share small number of style sheets, ensuring consistency across the site with no need for constant update and editing to accomodate changes.
References:
Complete CSS Guide, Why Use CSS, [Online], Retrieved 14 March 2011.
URL: http://www.westciv.com/style_master/academy/css_tutorial/introduction/key_ideas.html
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