Backlink indexing plays a crucial role in SEO because a backlink has no value unless it is indexed by Google. When a backlink is properly indexed, it signals to search engines that other websites trust and recommend your content. This helps improve your website’s authority, visibility, and search rankings. On the other hand, if backlinks remain unindexed, no link juice is passed, and your link-building efforts may go to waste. Therefore, it’s essential to ensure your backlinks are placed on high-quality, crawlable pages and supported with strategies like social signals or tier-2 backlinks to boost indexing and achieve maximum SEO benefits.