Key features of Joomla include:

• Free & Open Source: No licensing cost—Redistributable under GPL, with full access to core code.

• Extensible architecture: Use templates, modules, plugins, themes, and extensions to customize functionality and appearance.

• Multilingual support: Full language management built in—manage menus, content, and user interface in multiple languages.

• User Management & Access Control: Define user groups, permissions, workflows, and content versioning.

• Advanced Template System: Responsive layout control, visual overrides, and support for separate templates per site section.

• Performance Tools: Caching, GZIP compression, FTP layer, debugging, and admin help built into core.

• API/Web Services: Built-in support for XML-RPC, microdata, and cloud storage integration.

• Strong Community & Resources: Extensive documentation, forums, training, and active support ecosystem.