Taxonomies, as previously described are a collective noun for the following
-
category
-
post_tag
-
post_format
-
link_category
-
custom taxonomy
The first four are built-in taxonomies, while custom taxonomies are taxonomies that are manually created by the user with register_taxonomy
. Custom Taxonomies can be hierarchical (like the build-in taxonomy category
) or not (like post tags)
The categories and tags that you create in the back end under the ‘Posts’ screen are in actual fact terms of the taxonomies category
and post_tag
You cannot create extra terms in post_format
. post_format
has built-in terms like post_format_video
, post_format_gallery
etc. See the codex for all post formats included
EDIT
I have updated the Taxonomies page in the codex to include my diagram and the missing post_format
taxonomy
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