Posts are the core of WordPress. They store content, are categorized, and are expansible with meta. Posts are grouped by post type, and within their post type by taxonomy (though a taxonomy can span more than one post type).
There is no tag wiki for this tag … yet!
Tag wikis help introduce newcomers to the tag. They contain an overview of the topic defined by the tag, along with guidelines on its usage.
All registered users may propose new tag wikis.
(Note that if you have less than 20000 reputation, your tag wiki will be peer reviewed before it is published.)