Content Management System (CMS) is an application which allows you to customize the interface for your instance as well as for other application. The CMS application contains number of modules or components that target different aspects of user interface (UI).
A content site is a group of related pages that have the same basic theme, layout and URL suffix. Content refers to the type of information that the CMS will allow you to manage. You can manage virtually any type of content.
Types of content management system:
Different Content Management Systems
Benefits of CMS