Faceted navigation is the filtering and sorting system common on e-commerce and catalogue sites, allowing users to refine results by attributes such as colour, size, price range, brand, or rating. Each filter combination typically generates a unique URL, which can result in thousands or millions of near-duplicate or thin pages being indexed — a major source of index bloat and crawl budget waste. Managing faceted navigation for SEO involves deciding which filter combinations deserve their own indexable URLs (those with meaningful search demand), and blocking or canonicalising the rest. Google recommends using rel=canonical to point filter variants back to the base category page, or using URL parameters configured in Search Console, though neither approach is perfect. Getting faceted navigation right is one of the highest-impact technical SEO tasks for large e-commerce sites.