There are lot of heading you will find on the web regarding your mobile friendly sites. Like below
Google’s ‘Mobile-friendliness’ deadline
Mobile friendly? Are you ready? You better be by 21st April
Is your mobile friendly website ready for 21st April?
Is Your Website Ready For the Mobile Revolution?
Are you ready for Google’s mobile-friendly deadline?
Is Your Website Ready for Mobilegeddon?
What all this means and what is behind these titles on Web. It is simple when ever there is any announcement by Google regarding algorithm there is lot of noise from web marketers, optimizers and search marketing consultants.
It is simple that on 21st April Google will give importance to mobile friendly websites for only search results in mobile. Therefore your site can be hit in mobile search results if you are not mobile optimized or friendly.
Starting April 21, we will be expanding our use of mobile-friendliness as a ranking signal. This change will affect mobile searches in all languages worldwide and will have a significant impact in our search results. Consequently, users will find it easier to get relevant, high quality search results that are optimized for their devices.