CMS - Content Management System

A content management system (CMS) is a computer program that allows publishing, editing and modifying content as well as maintenance from a central interface. Such systems of content management provide procedures to manage workflow in a collaborative environment. These procedures can be manual steps or an automated cascade.
The first content management system (CMS) was announced at the end of 1990s. This CMS was designed to simplify the complex task of writing numerous versions of code and to make the website development process more flexible. CMS platforms allow users to centralize data editing, publishing and modification on a single back-end interface.

Types
Basically a content management system can be divided into two types:
Proprietary CMS:
A proprietary CMS is a content management system in which the back end code is available only to the particular developer, so only the single Admin can edit or customize the webpage.
Open source CMS:
An open source CMS is an open system that can be used by anyone to make any change by using any device.

A web content management system (web CMS) is a bundled or stand-alone application to create, manage, store and deploy 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. 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 CMSs usually allow client control over HTML-based content, files, documents, and web hosting plans based on the system depth and the niche it serves.