WordPress is an open-source content management system licensed under GPLv2. This means that anyone can use and modify the WordPress software for free.
In simple words, WordPress is software that can be used to develop websites. It is the simplest and the most used software to develop websites or blogs. In fact, WordPress powers over 37.6% of all the websites on the Internet. This means 1 or more websites in every 4 websites is powered by WordPress. This is the power of WordPress.
Matt Mullenweg and Mike Little created the first version of WordPress in 2003. It was developed as a platform that lets users upload their blogs on the web, but gradually it transformed into a powerful and flexible tool that can be used to develop any type of website.