This is a beginner’s tutorial that will quickly get you up and running with media entities and a media entity browser in Drupal 8.
One of the best parts of Drupal 8 is the in-core feature of media entities. This allows Drupal to manage resources that otherwise it would not be able to. It accomplishes this by creating a bridge relationship between Drupal’s CMS, media files and external sources. It’s basically an entity referencing all kinds of media files like images, videos, documents or other external sources like Tweets, embed videos, etc.