What is CMS?
CMS is an acronym for "Content Management Systems". Blogs you see on the Internet are either "WordPress", "Joomla" or "Drupal", to name a few.
A CMS system allows its user to add, change or modify content at any time, using tools like a word processor that is built into the CMS system. Each CMS system works with CMS themes. A theme is separate from the CMS system and integrates with the CMS system to give the layout and function of content.
A CMS framework as WordPress will show nothing unless there is a theme installed and content added. A theme would show nothing as it needs the CMS framework to work.
Major Businesses Use CMS
CMS used to be just for blogs. Today that has change dramatically. Major business websites use CMS as their core framework for their websites.
Look Who Uses CMS WordPress