Custom blocks in Drupal 8 are plugins. Finally, we encounter our first plugin type. For the sake of full disclosure, the content blocks that you create through the UI to place in a region and the custom blocks that are placed in a region are content entities. So, the block system is a good example of how entities and plugins work hand in hand in Drupal 8, and not to make matters too complex for you, configuration entities (about which we will learn in a later chapter) also play a big role here.
The block system in Drupal 8 is a great shift from its predecessor. Before, you had to implement two obligatory hooks plus two optional hooks if you wanted the block to have a configuration, and the latter was always saved somewhere that had nothing to do with the block itself. In Drupal 8, we work with a simple plugin class that can be made container-aware (that is, we can inject...
