Based on materials from androidauthority.com
Two days ago, Google started increasing the search rankings of mobile-friendly sites. This change is global and language independent, and aims to make sites across the web more mobile-friendly, especially for users of devices with small screens.
The innovation concerns the search only from the mobile device, and the search on the PC does not affect. It also highlights specific pages, so the entire site doesn't have to be 'mobile-friendly' to rank higher in the SERPs.
Google says: 'While mobile-friendly is important, we use different criteria to sort search results. Search targeting is still very important, so a site that has high quality content without being mobile friendly will rank high enough if it is highly relevant. '
Google has also created a tool to test the 'mobile friendliness' of sites. Google says that if your site is not mobile friendly, you will see a significant decrease in mobile traffic from Google searches. If you have your own website, this is a reason to think seriously. More information can be found here and on our Frequently Asked Questions page.