Summary Field
Next to the field name is a link that reads Edit Summary. When creating a content type, the creator decides whether the body text field should accommodate having a separate summary, and if so, that link is shown. The summary is used, for example, when providing a list of content for the site visitor, where a short description of the content—a teaser—is provided.
There are two ways to provide the teaser text: via a separate summary or by trimming, that is, excerpting text from the start of the content. I prefer to use the summary because trimmings are based on a set number of characters that is the same for all of the same type of content, such as the first 40 characters, so I have no control over where the excerpt will end... ...
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