---
title: Taxonomies and the Tag Groups Plugin
description: "Taxonomies are *types* of tags. By default, WordPress post uses **post_tag** (these are the standard tags) and **category** but other plugins can add their own taxonomies. Before working with the [Tag Groups](https://publishpress.com/links/tag-groups) plugin, decide which taxonomies you want to use. Activated taxonomies…"
url: "https://publishpress.com/knowledge-base/taxonomies/"
updated: "2026-10-04"
category: PublishPress Checklists / Settings
---

# Taxonomies and the Tag Groups Plugin

Taxonomies are *types* of tags. By default, WordPress post uses **post_tag** (these are the standard tags) and **category** but other plugins can add their own taxonomies.

Before working with the [Tag Groups](https://publishpress.com/links/tag-groups) plugin, decide which taxonomies you want to use. Activated taxonomies will have a "[Tag Groups](https://publishpress.com/links/tag-groups)" submenu under the menu where you find their posts.

The list shows also taxonomies that are not visible. Activate only those where you need the group functionality.

- The Tag Groups plugin works best with post tags and other flat custom tags.
- It is not recommended to activate more than one taxonomy per post type.
- Some features won't work with hierarchical taxonomies, such as categories.