Joomla can be used by Non-Technical Users.

It is User Friendly. Content can be changed, right on the website with nothing more complicated than a text editor.
A Joomla layout can be Easily Altered. The whole look and feel, the style and color of your website can be altered by uploading a new template.
It helps keepy our web content Organized. There is a powerful Content Management System available behind the scenes.
Plugins, many of them free, extend the capability of your website. There a literally thousands of plugins available to meet the needs of a particular site.
Joomla is Free. Did I mention it's free?
Your site can be Easily Maintained. Everything is there on the website. Nothing is locked away on the web developer's' computer.