In technical terms, CMS is an abbreviation for Content Management System. Such systems represent website management tools which are widely-spread and readily available.
Managing a website used to require tech knowledge, web experience and other skills, but now complete beginners can build and manage big-scale websites without prior training, with nothing more than a simple hosting account.
Using a content management system provides speed and ease of handling websites. These systems have a user-friendly interface. Other advantages are that you can use templates for nearly everything on your websites, easily improve the web security, looks and availability of features, without having a designer or programmer skill set. The main way this is achievable is by adding different kinds of plugins to your platform.
Popular CMS systems include WordPress, Magento, WooCommerce, Drupal, Wix, and Shopify.
Modern site owners use a CMS to maintain their sites and you might want to do that, too, if you want to use cutting-edge technologies with a few clicks. They are exceptionally useful and often included for free with almost all web hosting plans.