Pages vs. Posts
Posts are content entries listed in reverse chronological order on your site. Think of them as articles or updates that you share to offer up new content to your readers. They are the traditional “blog” style of content delivery. You can display posts on your site in different ways, such as by using the Blog Posts block or by setting a default posts page at Customize -> Homepage Settings.
If you have marked any posts as sticky, they will appear as pinned to the top of your blog before any other posts, regardless of their chronological order.
The URL for a post looks like this by default:
See the WordPress Posts Tutorial for more detailed information.
Pages are static content entries and are not affected by date. Think of them as more permanent fixtures of your site (an About page, a Contact page, and a Home page). You may also have a “Blog” page which is used to display your posts. Pages are typically listed in your site’s navigation menu.
The URL for a page looks like this by default:
See the WordPress Pages Tutorial for more detailed information.