Story snippets are a collection of content blocks that are primarily used as the building blocks of newsletters. The word choice of "snippet" here is intentional; rather than including all of the content about your story in the email itself, it should be a short summary to entice the reader to click on the link to read the full story. This allows for your email to remain short enough that it doesn't overwhelm the recipient.
Use multiple story snippets to build your newsletter, or start from the newsletter layout. 4-6 story snippets is an ideal number for a newsletter.
Story snippets have different designs for formal and informal styles.