Mobile-First Design

Mobile-First Design was developed to help web designers and developers improve mobile experiences by designing with the mobile use-case in mind first, and then adding functionality or content as the screens get bigger, usually in a Responsive Design format. The goal of mobile-first design is to avoid crowding the mobile screen by retrofitting desktop pages to fit into smaller mobile screens. In SEO, it is important to understand that Mobile-First Design is different from Mobile-First Indexing. Wile Mobile-First Design is generally Responsive, and designed to fit the mobile phone first, and expand from there, that does not necessarily mean that the site is fully optimized for Mobile-First Indexing.