The Drupal 8 "Flickr" module allows you to insert Flickr images or photosets (albums) on your site, without the need of keeping the images on your server. This has a couple of advantages (we won’t discuss the disadvantages in this tutorial):

• Less use of resources on your own server
• Improvements on the performance of the site
• You avoid copyright issues in your site, Flickr takes care of that
• Make use of thousands of Flickr images available under CC License.