Joomla
Joomla is a free and open-source content management system (CMS) written in PHP, used for building and managing websites and web applications. It provides a user-friendly interface for content creation and editing, along with extensibility through templates and extensions. Joomla is known for its flexibility, supporting everything from simple blogs to complex enterprise sites.
Developers should learn Joomla when building dynamic websites that require robust content management, such as corporate portals, e-commerce sites, or community platforms, as it offers built-in features like user management and multilingual support. It's particularly useful for projects where clients need easy content updates without deep technical knowledge, and its extensible architecture allows for custom functionality through extensions.