These are elements that are the same on all sites no matter what actual content it contains.
Because these strings are standardized, Drupal is able to create a system to provide everyone with translated values for all these elements in various languages.
This has meant removing old, more Drupal specific ways of doing things and embracing more widely known standards and technologies.
Drupal 8 includes new features and improvements for both users and developers, including: a revamped user interface; WYSIWYG and in-place editing; improved mobile support; added and improved key contributed modules including Views, Date, and Entity Reference; introduced a new object-oriented backend leveraging Symfony components; revamped configuration management; and improved multilingual support.
But with the arrival of Drupal 8, you may be contemplating your first foray into the new version, which you've probably heard is a completely re-written version of the platform. At OSTraining we've been studying these features; we're already starting to work with them.
So here's an introduction to 10 new features that we think will be exciting when you use Drupal for the first time.
Drupal 7 provided image styles in the core, which allowed you to automatically resize images.
Drupal 8 takes that a step further and allows you to choose different styles for individual images.