Private WordPress posts can only be seen by the person who created the post, and any guests who have been invited to view it. Anyone else who tries to view the post without being authorized will be greeted with a message telling them that they are not allowed to view the post.
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Private WordPress Pages
A private WordPress page is a page that is not published on the WordPress.com site. When you create a private page, you can control who can see it and how it is displayed. To view a private page, you first need to know the URL for it.
Private posts are posts that are not published on the front-end of WordPress. Private posts are only visible to the author and the people who are subscribed to their blog. Private posts can be used for a variety of purposes, such as for internal communications, tracking project progress, or for sharing personal information.