additional description window to add an excerpt, which is a summary of the post that is going to appear on the home or blog page. If the excerpt is not filled out, then most of the theme templates will take some text from the blog post content.
For my example, I’m going to fill the ‘Content’ box with some fun Hipster Ipsum text, and we’re going to see what the post looks like without filling in anything in the ‘Excerpt’ area.