A LinkedIn profile summary is simply the bio or About section you see at the top of a LinkedIn profile. It typically comprises a few sentences or paragraphs introducing the LinkedIn user before you dive into the nitty gritty of their employment history and education.
When visiting a LinkedIn profile, you’ll usually only see the first lines of the person’s summary or bio, just below the “About” heading. To read more, you’ll have to click on the “...see more” link in the bottom right-hand corner of this block.
There’s also a restriction on the total number of characters you can use to create your LinkedIn About section: 2,600. That might sound like more than enough, but when your LinkedIn bio is what stands between you and a prospect responding to your messages, you’ll quickly find plenty to say.