Munk's Blog

The term "Web 2.0" was coined by Darcy DiNucci in 1999 in her article "Fragmented Future".
The Web we know now, which loads into a browser window in essentially static screenfuls, is only an embryo of the Web to come. The first glimmerings of Web 2.0 are beginning to appear, and we are just starting to see how that embryo might develop. ... The Web will be understood not as screenfuls of text and graphics but as a transport mechanism, the ether through which interactivity happens. It will [...] appear on your computer screen, [...] on your TV set [...] your car dashboard [...] your cell phone [...] hand-held game machines [...] and maybe even your microwave.
Her arguments about Web 2.0 are nascent yet hint at the meaning that is associated with it today.
Wikipedia

"Web 2.0" refers to a perceived second generation of web development and design, that facilitates communication, secure information sharing, interoperability, and collaboration on the World Wide Web. Web 2.0 concepts have led to the development and evolution of web-based communities, hosted services, and applications such as social-networking sites, video-sharing sites, wikis, blogs, mashup and folksonomies.
Wikipedia

Web 2.0 web sites allow users to do more than just retrieve information. They can build on the interactive facilities of "Web 1.0" to provide "Network as platform" computing, allowing users to run software-applications entirely through a browser. Users can own the data on a Web 2.0 site and exercise control over that data. With regard to web design, a web site is thought by many to only be considered web 2.0 if it displays a particular layout format, a key example would be http://www.morediverse.com (this is not classified a web 2.0 web site, although it portrays the layout design and aesthetic qualities of a web 2.0 site), however web 2.0 is far more than this. A web 2.0 web site design must integrate an interactive element allowing its users to control much of the content and even aesthetics of the site. These sites may have an "Architecture of participation" that encourages users to add value to the application as they use it. This stands in contrast to traditional web sites, the sort that limited visitors to viewing and whose content only the site's owner could modify. Web 2.0 sites often feature a rich, user-friendly interface.
Critics have cited the language used to describe the hype cycle of Web 2.0 as an example of Techno-utopianist rhetoric. Critics such as Andrew Keen argue that Web 2.0 has created a cult of digital narcissism and amateurism, which undermines the notion of expertise by allowing anybody, anywhere to share (and place undue value upon) their own opinions about any subject and post any kind of content regardless of their particular talents, knowledgeability, credentials, biases or possible hidden agendas. He states that the core assumption of Web 2.0, that all opinions and user-generated content are equally valuable and relevant is misguided, and is instead "creating an endless digital forest of mediocrity: uninformed political commentary, unseemly home videos, embarrassingly amateurish music, unreadable poems, essays and novels," also stating that Wikipedia is full of "mistakes, half truths and misunderstandings".
Wikipedia

"Content Management System" is generic computer terminology for any software system that helps organize the collection and retrieval of digital information."Web Content Management System" is sometimes used to specify a web based information system. The difference between a web site and a CMS based web site is how the site is managed. Adding, editing, and deleting content are basic management tasks for any web site. A CMS combines a database with a collection of web pages to assist in the management of the site. The database holds information about the structure of the site. The database holds information about the people who use the site. The database is used to assign rights to individuals and groups. The assigned rights (privileges) determine who may add, edit or delete content on specific pages of a web site.

Concrete5 is a Web Content Management System. It is an "open source" project which means it is free. You can download the code for this CMS to your PC, upload the downloaded code to your web host, run the install program, create a database on your web host, and have your own Content Management System.
See my site http://www.bedsidebooks.com/ .

Development of concrete5 began in 2003 as a rapid-design approach to building the now-defunct LewisAndClark200.org, the official site for the AdCouncil's National Council for the Lewis & Clark Bicentennial. Regular updates and security patches have been released. Version 5.3.1 was released on April 22, 2009
Wikipedia.