What’s an excerptLink to this section

An excerpt is a summary text associated with posts or custom post types (if enabled). It is optional. If you leave the excerpt field blank, ClassicPress will generate an excerpt automatically using the first 55 words of the post’s content.
Excerpts are used by themes in various places, such as search results and archive pages, blog pages, content sliders, and more. Some SEO plugins will use excerpts to generate automatic meta descriptions.
If your post is missing an excerpt metabox (seen above), you can enable it by going to Screen Options in the top right corner.
For custom post types, you must declare excerpt support when registering a custom post type using $supports argument.
Display excerpts on the posts pageLink to this section
Your theme determines how content is displayed on the posts page. Some themes allow you to choose between displaying the excerpt (summary) or the full text of each post.

Display excerpts in feedsLink to this section
By default, ClassicPress comes with various feeds. You can include the excerpt (summary) or the full text of each post in a feed. To include the excerpt:
- Go to Settings > Reading
- Find the “For each post in a feed, include” option
- Select “Excerpt” to enable the use of excerpts
For detailed information about feeds, see this WordPress article.