Drupal 8 Render API

You know that it plays a key role in displaying (custom) content in Drupal. You know that it shouldn't miss from your toolkit as a Drupal module developer. And yet, it's still unclear to you: what is the Drupal 8 render API more precisely? How does it work? When/how do you use it? And how is it any different from Drupal 7's rendering logic? Let's dig deep for some clear answers, shall we? What Is Drupal 8 Render API? A short, yet thorough answer would be: It's the...