The main difference is in ease of use vs flexibility.
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WordPress is simpler and beginner-friendly. Most people choose it because it’s easy to install, has thousands of themes and plugins, and is great for blogs, business sites, and e-commerce. You don’t need much technical knowledge to manage it.
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Joomla is more flexible and powerful for developers. It offers stronger options for user management, multilingual websites, and complex portals. But it’s not as beginner-friendly as WordPress—you need a bit of technical skill to handle it.