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With Friendly Content Blocks, you can save entire sections of your email and reinsert them into other mailings later with just a few clicks. This way, you only have to create frequently used content, such as the hero section, footer, or call-to-action, once.
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A Friendly Content Block is a reusable section for your emails. A single Content Block always consists of a complete section. A section can contain any number of elements, such as text, images, buttons, or multiple columns.
You can save any section of your emails as a content block. This allows you to reuse sections of your emails that you use frequently in every email.
Typical examples of content blocks include:

Open an existing email or create a new email (Create emails in the email editor).
Now click on a section that you want to save as a content block.