WordPress is a free and open source blogging tool and a content management system (CMS) based on PHP and MySQL. It has many features including a plug-in architecture and a template system.
Why choose WordPress for your website
It is open source
This basically means the software is free to download and use, this encourages innovation and creates a helpful community, willing to share it’s knowledge.
It is very easy to Install
It has thousands of available add-on features
If you are looking for a particular feature on your website, it’s highly likely that someone else has already created it as a WordPress plugin. And that means that you can use it, usually for free (although there are some paid plugins that give you advanced features).