WordPress Custom Taxonomy

WordPress comes with familiar classification systems such as categories and tags. Developers can also register custom taxonomies for a site-specific purpose, such as product material, project location or service specialization. Each taxonomy contains terms; depending on the configuration, those terms may be hierarchical or nonhierarchical.

WordPress provides register_taxonomy() to define or modify a taxonomy and connect it to supported object types. Implementation decisions include labels, visibility, REST API support, permissions, rewrite rules and how archive pages are handled. Creating a taxonomy in code is different from assigning a tag to a single post.

A custom taxonomy is useful only when the classification helps both editors and users. Avoid producing thousands of empty or repetitive term archives; plan templates, indexing behavior and navigation before exposing archives to search engines. Test taxonomy registration and content editing in a staging environment.