Google next big update is going to target non-mobile friendly sites and is expected to roll out April 21, 2015, and roll out for a few days to a week.
This is a big one, and could affect a large portion of your web traffic.
In the last few years, mobile traffic has increased dramatically. It’s speculated that more than 50% of Google searches are performed on mobile. Even Google is saying this update is going to have a bigger effect on search rankings than Panda or Penguin, the biggest updates Google has ever launched, as quoted by a member of Google’s Webmaster Trends team, Zineb Ait Bahajji at SMX Munich.
The problem is many sites are not responsive, meaning that they were only built for desktop computers and are hard to navigate on mobile devices. Google doesn’t want to serve up results that don’t are not user friendly, so they are implementing a new algorithm change to demote sites that aren’t usable on phones and tablets.