A block is a small, modular piece of content or functionality that can be displayed in various regions of a website, such as the header, footer, or sidebar. Blocks can contain a variety of content, including text, images, forms, menus, and more.
Blocks are created and managed through the Blocks administrative interface in Drupal. To create a new block, you will need to log in to your Drupal site as an administrator and go to the Content section of the administrative dashboard. From there, you can click on the Blocks tab to access the blocks management page.