In WordPress, both pages and posts have ‘authors’.
Any page or post (blog posts in particular) will have an author. Whilst not all sites will show authors on the front-end, it can be really handy if you have several people working on your blog.
You can also swap the author of a post so if someone in your team wasn’t a user on the site, it can be swapped to another user. Some sites also include a little bio about the author – it can be a good way for visitors to get to know your team and, if they enjoyed their content, find more written by them.
Author is also a predefined user role within WordPress, along with editor, administrator and subscriber, among others. In their role, they mainly have access to posts to create, edit and delete them.