
A CMS (Content Management System) is a content management system. Its main function is to facilitate the creation, management, and publication of content on a website, without requiring in-depth technical knowledge in programming or web design.
With its many features, CMS allows users to easily create and edit web content, such as articles, pages, images, videos, etc.
As well as defining the different levels of access and permissions for users authorized to contribute to the site, including administrators, editors, and publishers.

One of the most popular CMS I use is WordPress. Launched in 2003, it has become a versatile platform for creating and managing websites of all kinds, from personal blogs to complex business sites.
The main functions of a CMS include
Managing extensions and plugins
Allows you to add additional functionality to the CMS through extensions or plugins, such as contact forms, image galleries, e-commerce features, etc.
Management of
updates
Provides tools to regularly update the CMS and its extensions to ensure the security and stability of the site.
Managing categories and tags
Allows you to organize site content into categories and tags to make it easier for users to navigate and search.
Backup system
Provides functionality to regularly backup site content and restore previous versions when needed.
Security
Provides features to protect the site from security threats, such as user authentication, brute force attack protection, etc.
IN BRIEF
A CMS simplifies content management on a website by providing a user-friendly interface and varied functionality for users without advanced technical skills.