WordPress is a free and open source content management system (CMS) based on PHP and MySQL. It is 100% free code that can be customized to meet anyone’s needs. It has many features including a plug-in architecture and a template system. WordPress is used by over 14.7% of Alexa Internet’s “top 1 million” websites and as of July 2015 manages 24% of all new websites. WordPress is currently the most popular CMS in use on the Internet according to Wikipedia.
WordPress is as simple as you want it to be or a tuned sports car. WordPress allows rapid deployment of websites and blogs with little to no effort. WordPress offers fully customizable user interface for you or your client. WordPress can be very complex or simplified for the most novice users. WordPress is backed by a large community of developers and users. WordPress can extend its features by simply activating a plugin. Plugins, can be downloaded from the WordPress Plugin Repository.
There are also a ton of paid plugins that add on features such as eCommerce shopping cart, event registration, hotel management and more. If your looking for a specific WordPress Plugin, I bet someone has created one that meets your needs. Do a quick search in the WordPress Plugin Repository and see what you come accross. If you get adventurous visit the WordPress Codex and learn how to develop your own WordPress Plugins.