Joomla is a popular open source content management system (CMS) that allows users to easily build and manage websites and online applications without needing technical skills. A CMS like Joomla tracks and stores all website content, making it simple for users to manage. PHP and MySQL are commonly used programming languages that allow for dynamic website content and interaction with databases. Cascading Style Sheets (CSS) provide an easy way to control formatting and visual design across an entire website without needing to modify HTML. Simple free website building tools allow users to create basic sites without coding knowledge.