Responsive web design (RWD) is an approach to web design aimed at crafting sites to provide an optimal viewing and interaction experience—easy reading and navigation with a minimum of resizing, panning, and scrolling—across a wide range of devices (from desktop computer monitors to mobile phones).
With a Content Management System (CMS) like WordPress or Joomla, you’ll have the freedom to easily manage your website and keep it up-to-date in an easy to use environment.