WordPress is a free and open source content management system (CMS) based on PHP and MySQL. It is the most widely used CMS software in the world, and as of May 2019, it powers more than 30% of the top 10 million websites and has an estimated 60% market share of all websites built using a CMS.
The latest WordPress version is 5.5 “Eckstine” that came out on August 11th, 2020. Other recent versions include: WordPress 5.4. 2 Security and Maintenance Release.