Drupal 8 core introduced the concept of experimental modules. These are modules that are provided with Drupal core for testing purposes, but that are not yet fully supported. Experimental modules are included in the Core (Experimental) package on the Extend page of a Drupal site (/admin/modules).
Introduction to experimental modules and themes, and a list of them currently in development
How to remove an experimental module that did not make beta stability from the release
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