Joomla version 4 is a significant update from Joomla version 3, introducing several notable changes and improvements. Here are some of the main changes in Joomla version 4 compared to Joomla version 3:

1. Codebase: Joomla 4 has been rewritten with a modernized codebase using the latest PHP version (currently PHP 7.4 or later). This ensures better performance, improved security, and compatibility with newer technologies.

2. User Interface: The user interface (UI) in Joomla 4 has undergone a complete overhaul, providing a more modern and user-friendly experience. The new backend template, named "Cassiopeia," offers a cleaner and more intuitive interface for managing the website.

3. Accessibility: Joomla 4 places a strong emphasis on accessibility, adhering to WCAG 2.1 (Web Content Accessibility Guidelines) AA standards. This makes the CMS more inclusive and enables websites to be accessible to a wider range of users, including those with disabilities.

4. Improved Media Manager: The Media Manager in Joomla 4 has been enhanced with a more streamlined and intuitive interface. It offers improved drag-and-drop functionality, better file management capabilities, and support for additional media types.

5. Enhanced Workflow: Joomla 4 introduces a new workflow feature that allows content creators to define approval processes and assign specific roles to users for content management. This facilitates better collaboration and content governance within the CMS.

6. Updated Extension System: The extension system in Joomla 4 has been revamped to align with industry standards and improve compatibility. The new extension system provides better support for modern development practices and offers a more streamlined installation and update process.

7. Mobile-First Approach: Joomla 4 adopts a mobile-first approach, ensuring that websites built with the CMS are fully responsive and optimized for mobile devices. The administration interface is also designed to be responsive and mobile-friendly.

8. SEO Improvements: Joomla 4 includes built-in improvements for search engine optimization (SEO). It provides better control over metadata, improved URL structure, and enhanced markup for search engines to understand and index the content effectively.

9. Multilingual Support: Multilingual support has been enhanced in Joomla 4, making it easier to create and manage websites in multiple languages. The core language management features have been improved, allowing for better translation and localization.

These are just some of the key changes and improvements in Joomla 4 compared to Joomla 3. The update brings significant enhancements in terms of technology, user experience, accessibility, and developer features, providing a more modern and robust platform for building websites.

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