In Drupal, a block is a piece of content that can be placed in a region provided by a theme. Blocks are used to present specific kinds of content, such as a user login form, a snippet of text, and many more.
Blocks are annotated plugins. Annotated plugins use documentation blocks to provide details of the plugin. They are discovered in the module's Plugin class namespace. Each class in the Plugin/Block namespace will be discovered by the Block module's plugin manager.
In this recipe, we will define a block that will display a copyright snippet and the current year and place it in the footer region.
