Mobile-First Indexing refers to Google’s approach to indexing and ranking websites based on their mobile versions rather than their desktop versions. This means that Google predominantly uses the mobile version of a site for indexing and ranking in search results.
With the increasing use of smartphones and tablets for web browsing, Google has shifted its focus to ensure that websites are optimized for mobile users. Websites that are mobile-friendly—those that load quickly, are easy to navigate, and display content effectively on smaller screens—tend to perform better in search rankings.
In essence, mobile-first indexing prioritizes the mobile user experience, reflecting the shift towards mobile usage and ensuring that users have a seamless browsing experience regardless of the device they use.