That ubiquitous source of all things web, Wikipedia describes a web content management system as:
A content management system (Web Content Management System) is a bundled or stand-alone application to create, deploy, manage and store content on Web pages. Web content includes text and embedded graphics, photos, video, audio, and code (e.g., for applications) that displays content or interacts with the user. Content Management has many roles in today's market place and is an important base for any website blogging, articles, news, description of products etc. A Web CMS may catalog and index content, select or assemble content at runtime, or deliver content to specific visitors in a requested way, such as other languages. Web Content Management System's usually allow client control over HyperText Markup Language - based content, files, documents, and Web hosting plans based on the system depth and the niche it serves.
The short answer is anyone who aspires to have an easily managed website, whether the site be one page or 1,000's of pages.
Web applications like CMS systems separate content from form (layout and visual appeal) and function (navigation, publication status, permissions, etc). They allow you to concentrate purely on your message. It's more than just WYSIWYG.
A worthwhile CMS set up correctly will allow you to grow and update your site free from the hassles of accessibility and search engine optimization features, cross-browser compatibility and a host of other factors that affect how people will find and view your information.
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