Mobilegeddon refers to the significant and sudden impact on websites that are not optimized for mobile devices, particularly smartphones and tablets. This term was coined in 2015 when Google updated its search algorithm to prioritize mobile-friendly websites, causing a dramatic drop in search rankings for non-compliant sites. The term is a play on the word “Armageddon,” emphasizing the catastrophic consequences for businesses and organizations that fail to adapt to the increasing use of mobile devices for internet browsing. Mobilegeddon serves as a reminder for website owners to prioritize mobile optimization in order to maintain their online presence and reach their target audience effectively.