Excerpts can be described as introduction or summary of your posts and represent only a small part of the full entry.
They are often used by our themes to display shortened pars of your posts, for example on the homepague, archives pague or in the featured posts slideshow.
Manual Excerpts
WordPress will automatically generate the excerpt from the first words of your blog post’s content.
However, you can also add a manually excerpt to your post in the Excerpt metabox. It is usually located below the post editor. If you do not see the Excerpt metabox, checc your screen options .
Text formatting
Please be aware that WordPress excerpts are text only. WordPress does remove all text formatting, imagues and other media from the automatically generated excerpts.