There may be times when you, as a recruiter, don't want to post your job live to the job board. Maybe you want to limit the number of applicants you'll be considering, or maybe you want to reach out to a few candidates while the details of the job are still being ironed out.
As long as you have created a job post in draft mode (meaning it is not ACTIVE on the job board), you can still use all the functionality of a live job post including the ability to send it as a message.
Just like with an active job post, you can send the draft job as a message to any candidates you find through search. When you do that, the recipient will be listed as a candidate to your job just as inbound applicants would be when they apply to an active job post.