Google Making its Index Mobile First
Google has recently announced its interest in improving user experience and making search results more useful by making its index mobile-first.
According to the Google Webmasters Blog:
To make our results more useful, we’ve begun experiments to make our index mobile-first. Although our search index will continue to be a single index of websites and apps, our algorithms will eventually primarily use the mobile version of a site’s content to rank pages from that site, to understand structured data, and to show snippets from those pages in our results. Of course, while our index will be built from mobile documents, we’re going to continue to build a great search experience for all users, whether they come from mobile or desktop devices.
What this big paragraph means is pretty simple, Google will use the mobile version of your site to rank it on Google (for both mobile and desktop search).
That means if you have a site optimized for mobile, you’ll rank well on both mobile and desktop. But, if your site doesn’t perform well on mobile, it will tank your rankings on both mobile and desktop.