What is the difference between CMS and web-framework?

Guys,
sorry for a stupid question, I am a newbee in web-development and I would like to know whats the difference between java CMS, such as Magnolia and openCMS, and java web-frameworks, such as Struts, Spring MVC.
What can I do using the CMS and what CMS cannot do?
Have you used some of them, can you recommend something?
If I need some solution to start with while creating my own internet-shop, what you can recommend?

CMS in web world usually means a storage of pages or peaces of pages in some format that can be extracted be the web framework and used to compose pages. It may be HTML or not but the form inserted into HTML pages is usually HTML.

The idea is to make it possible for HTML specialists and, say, legal stuff to work on the look and feel and, accordingly, on the wording the way that the programmers are not bothered and vice verse. Besides that may be about content in several languages and same native language speakers may work without interaction with programmers.

Using CMS makes sense only if the project is big enough.

A simple explanation for the two.