There are five post types that are readily available to users or internally used by the WordPress installation by default.
Post in WordPress is a post type that is typical for and most used by blogs. Posts are normally displayed in a blog in reverse sequential order by time (newest posts first). Posts are also used for creating the feeds.
Page in WordPress is like post, but it lives outside the normal time-based listings of posts. Pages can use different pagetemplates to display them. Pages can also be organized in a hierarchical structure, with pages being parents to other pages, but they normally cannot be assigned categories and tags. If permalinks are enabled, the permalink of a page is always composed solely of the main site URL and the user-friendly and URL-valid names (also referred to as slug) of the page and its parents if they exist. See the Pages article for more information about the differences.
is a special post that holds information about a file uploaded through
the WordPress media upload system, such as its description and name. For
images, this is also linked to metadata information, stored in the wp_postmeta
table, about the size of the images, the thumbnails generated from the
images, the location of the image files, the HTML alt text, and even
information obtained from EXIF data embedded in the images.
Revision is used to hold a draft post as well as any past revisions of a published post. Revisions are basically identical to the published post which they belong to, but have that post set as their parent using the post_parent column of the wp_posts table.
is a type that holds information about a single item in the WordPress
navigation menu system. These are the first examples of entries in the wp_posts table to be used for something other than an otherwise displayable content on the blog.