WordPress is web software that you can use to build your website. It’s free, it’s reliable, it’s powerful and it’ll grow with your needs.
What more do you really need to know?
You can diligently read through the WordPress.org website for more information, but do you really care to know the technical details of what an amazing content management system WordPress is and how geeky types rave about the functionality and scalability? Hmm…
Maybe not right now.