Automatic Summary 

In any list view (a view created with content that is coming from other pages, such as a list of articles or action alerts, or the list of promoted items on your front page), each item within the list is created from the title of the content (article, event, etc.), the image associated with content, the type of content (article, event, etc.), and a summary, or teaser bit of content. This teaser is created by default from the first 200-300 characters of the content (which includes invisible mark-up characters, also known as HTML).

Edit Summary

The teaser text can be specially written to appear in the list.

This opens the box for inputting the summary text.

This summary text replaces the lines from the body in list displays: