I need to build a site for a client. How will Joomla! help me?

Joomla is designed to be easy to install and set up even if you're not an advanced user. Many Web hosting services offer a single-click install, getting your new site up and running in just a few minutes.
Since Joomla is so easy to use, as a Web designer or developer, you can quickly build sites for your clients. Then, with a minimal amount of instruction, you can empower your clients to easily manage their own sites themselves.
If your clients need specialized functionality, Joomla is highly extensible and thousands of extensions (most for free under the GPL license) are available in the Joomla Extensions Directory.