Publisher turns WordPress post editor to a real editor! It means what you write in admin editor is what you will see in your website.
When you are writing a post, there is no need for checking post preview, because with Publisher, you see WordPress editor just like what it seems in final result. You see different elements and parts of the page as they are arranged in Publisher post. Look at below image.
Every element and content takes its place and you have a real perspective of the final result. If you’ve worked with themes without this feature, you know how handy and pleasant this feature is.