WordPress is an online, open source website creation tool written in PHP. But in non-geek speak, it’s probably the easiest and most powerful blogging and website content management system (or CMS) in existence today.
WordPress is, by far, the most popular open source Content Management System (CMS), used by approximately 75 million websites. WordPress is free to install, deploy, and upgrade. Thousands of plugins and templates power a flexible and simple interface, which reduces development costs and deployment time