Mobilegeddon is a super intense term that is supposed to strike fear into the hearts of all those that don't have mobile friendly websites. It's the name given to Google's new algorithm update that rolled out April 21st, 2015. This change will affect mobile searches in all languages worldwide and will have a significant impact on search results. Websites that don't utilize mobile best practices will be penalized and will drop in the rankings. While "Mobilegeddon" is an intimidating word associated with the update and is a little fear mongering, it's still important for you to make sure your site is mobile ready.