Internally, all of the Post Types are stored in the same place — in the wp_posts database table — but are differentiated by a database column called post_type.

Default post type

• Post (Post Type: ‘post’)
• Page (Post Type: ‘page’)
• Attachment (Post Type: ‘attachment’)
• Revision (Post Type: ‘revision’)
• Navigation menu (Post Type: ‘nav_menu_item’)

Custom post type

register_post_type