A global block is a reusable content block that can be inserted across multiple pages. Any changes made to the global block are automatically synchronized on all pages where it is used.
Use Case:
Suppose you want to create a footer for three specific landing pages. You can create a global block for the footer and insert it into these three pages. In the future, if you need to update the footer, you only need to edit the global block, and the changes will reflect on all three pages automatically.