For the end user Joomla! is amazingly easy to add content any time you like, even from the front end of the site. In fact, if you can write a word document, you can add content to Joomla!
Beyond being easy to update, Joomla! has an enormous following of developers who offer 1000's of free and commercial add-ons to expand the functionality of Joomla!, which in turn creates limitless possibilities for the type of website that can be produced.
Joomla! is scalable too, so Whether you are looking to start an ecommerce website, a Yahoo style directory, a community driven website, anything in between, or just want to start with a simple informative website, Joomla! is the way to go.