Mobile-first indexing means Google’s bot emulates a mobile user visiting your website when collecting data to help determine how to index and rank your pages. If your website’s mobile experience is missing content, has poor navigation, or loads slowly, it can hurt your search performance. For example, if product details or service descriptions only appear on your desktop site, Google may not see them. That’s why a complete, fast and user-friendly mobile experience is critical. Learn more in our blog: Mobile-First Indexing 101.