Google‘s rolling out mobile-first indexing
Google announced on their official blog about rolling out mobile-first indexing. After a year and half of experimentation, Google started to migrating sites that follow best practices for mobile-first indexing.
Before, the algorithm for mobile results focused on the relevance of page’s content on the desktop version and not on mobile. Mobile-first indexing means, crawlers will use the mobile version of a webpage for indexing and ranking, for better output for mobile users to find the best results on what they’re looking for.
As per Google, there’s no separate algorithm for mobile-first index, they continue using one single index they been using to serve results on the SERP.
Google will notify sites that are migrating to mobile-first indexing thru messages on Search Console. Here’s a screen shot of notification:
Google also said, “Site owners will see significantly increased crawl rate from the Smartphone Googlebot. Additionally, Google will show the mobile version of pages in Search results and Google cached pages.”
Google also explained, mobile-first indexing is about how they gather content not on how content is ranked. Additionally, if your sites only have desktop content, your sites will be indexed.