Open Source Software (OSS) in the context of WordPress means that the WordPress core software, themes, and many plugins are released under an open-source license, specifically the GNU General Public License (GPL).
What This Means:
- Freedom to Use
Anyone can download WordPress and use it for any purpose without paying licensing fees. - Freedom to Modify
You can access the source code of WordPress, themes, and plugins, and modify it to suit your needs. - Freedom to Distribute
You can redistribute WordPress, your modified versions, or derived works freely. - Community Contribution
WordPress is built and maintained by a global community of developers, designers, translators, and users. Anyone can contribute to improving the platform. - Transparency & Security
Because the source code is open, it is continuously reviewed by developers worldwide, making it more secure and reliable over time.
In Practice for WordPress:
- The WordPress Core itself is open source.
- Most themes and plugins in the WordPress.org repository are also open source.
- Developers can build their own plugins or themes using WordPress’ open-source codebase and release them under the same GPL license.





