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Consistency and ease of use. Rather than hardcoding EVERY page (especially those that look alike) with HTML, you make ONE CSS sheet and have every page call it and insert the information as needed. It also makes modifying the site easier; if you decide to reformat something, you change things ONCE in CSS and every page changes.
Imagine is a site like Amazon decided to change their sales page for a book. Millions of books. With CSS, they change one element and every page changes. As opposed to....
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