WordPress is free, open-source, and the most popular content management system based on PHP and MySQL. It is a customizable CMS supporting plugins that allows you to set up blogs and websites easily. WordPress provides a rich set of features and benefits including publishing tools, flexibility, simplicity, media management, user management, an easy theme system, customizability, and more. If your Linux system has 1 CPU and 4GB RAM, you can run multiple WordPress sites on a single server. Apache virtual host allows you to host multiple WordPress sites on a single server with a single IP address and multiple domain names.