Content Management is a software, where you can add, edit, delete any content from your websites admin control panel, without any ftp software like dreamweaver, filezilla. In one sentence, you can manage your website, without much knowing any HTML. (sorry for my poor english)
Content management is the ability to add/modify the content on your webpage. What barsha01 is referring to is 'Content Management System' which might be what your question was intended to be.
Content management, or CM, is the set of processes and technologies that support the collection, managing, and publishing of information in any form or medium. In recent times this information is typically referred to as content or, to be precise, digital content. Digital content may take the form of text, such as documents, multimedia files, such as audio or video files, or any other file type which follows a content lifecycle which requires management. Content management practices and goals vary with mission. News organizations, e-commerce websites, and educational institutions all use content management, but in different ways. Content management is an inherently collaborative process. It often consists of the following basic roles and responsibilities: Creator - responsible for creating and editing content. Editor - responsible for tuning the content message and the style of delivery, including translation and localization. Publisher - responsible for releasing the content for use. Administrator - responsible for managing access permissions to folders and files, usually accomplished by assigning access rights to user groups or roles. Admins may also assist and support users in various ways. Consumer, viewer or guest- the person who reads or otherwise takes in content after it is published or shared. Source: en.wikipedia.org/wiki/Content_management ---------------
I would suggest Joomla! if you are looking for an specific one. I has been the best so far for quite a long already, it is a mature product, with a huge community behind and the best, free