In the most basic explanation, post types are a way to categorize
  content on your site. Using post types correctly can help with
  the following:
  For site administrators
  - Manage content more efficiently
  
 
  - Restrict the types of content that various user roles can
  create
  
 
  - Display content in creative and more efficient ways
  
 
  For site visitors
  - Better understand the type of content they are viewing
  
 
  - Use site search by broken down by post type
  
 
  - View content in creative and efficient ways
  
 
  Learn more about post types in the 
  All About Post Types folder in the knowledge base.
  Browse through the post types below to see how they can be used
  on your site.
  The “Overview” Post Type
  The Overview post type acts and displays differently than other
  posts on the site. Here are a few of the more important
  differences:
  - All body content of an Overview will display on the term
  page; in Posts, only the teaser will display by default
  
 
  - Overviews should not be tagged to more than one navigation
  term as it breaks the functionality of the Overview on some
  templates; Posts/Pods can be tagged to as many terms as is
  necessary
  
 
  - Every navigation term should have an Overview, even if it’s
  just a title that duplicates the navigation term name; not every
  term will necessarily have Posts/Pods other than the Overview