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As your developer builds your site, she assigns names to your pages. It's an easy task on small sites, but sites with thousands of pages become overwhelming. Instead, developers often use content management or storefront systems that automatically generate URLs for dynamic pages pulled from databases, such as product catalogs. Unfortunately, search engines are better at crawling static pages; they might have trouble with or ignore dynamic pages.
Include different keywords in URLs for different pages, instead of using arbitrary file names. For instance, a URL for a bakery site might read: www.Yourbakery.com/storefront/fresh_breads.htm