If you are a large online retailer, you're looking at thousands upon thousands of pages that have the opportunity to get crawled and indexed in the SERPs (search engine results pages). You're also looking at near infinite choices for how you interlink all those pages. Out of all those permutations, there is one configuration that is the most optimal from an SEO perspective. That's because it maximizes the flow of link juice (e.g., PageRank if you're speaking purely in Google terms) to your most important pages and minimizes (or cuts off completely) the flow of link juice to your least important pages. The most important pages are the ones that have the most potential to rank highly for the targeted keyword themes, to compel the searcher to click, and to drive that visitor toward a "conversion event" such as completing a purchase of one or more high-margin products.

To achieve that search engine optimal configuration of your internal linking structure, you need to think strategically about how you "spend" the link juice that has been bestowed on your site through inbound links.

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