While ”WordPress” might refer to the WordPress ecosystem overall, including themes, plugins and other types of extensions, ”Core” refers to the files that power the actual WordPress system software and come included in every download of WordPress. It’s a developer term, and not something most WordPress users need to be concerned with.

The WordPress Core development team is the group of developers that contribute new features and bug fixes to the WordPress system software. Anyone can contribute to the development of WordPress by visiting the Make WordPress Core page on and submit bug reports and code patches.

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