websites change frequently and thus you need a simple way to update content.
about 40% of all websites use a CMS. WordPress has over 60% market share followed by Joomla 8% and Drupal 5% (source: w3techs).
content management systems are often used to run websites in order to avoid the need for hand coding and thus allowing "non-technical" persons to manage content.
what is content management?
A content management system (CMS), is a computer application that allows publishing, editing and modifying content, organizing, deleting as well as maintenance from a central interface. Such systems of content management provide procedures to manage workflow in a collaborative environment.
definition from Wikipedia
WordPress has become very popular over the last few years. Any company that wants to control content should consider WordPress. we built "enterprise class" sites with staging and production servers using GitHub version control. see our portfolio for WordPress sites we built.
Besides WordPress, we have built sites with Joomla and WebAssist, each having its own advantages that may just fit your specific needs.