> ## Documentation Index
> Fetch the complete documentation index at: https://docs.open-metadata.org/llms.txt
> Use this file to discover all available pages before exploring further.
# Classification | OpenMetadata Data Classification Guide
> Learn how to classify data using tags, tiers, and rules to improve governance, discovery, and sensitivity tracking.
# Classification
**Classification** is a controlled vocabulary and can be used for labeling data. A controlled vocabulary is an organized arrangement of words and phrases to define terminology to organize and retrieve information. Classification helps in defining the type of data.
Watch the [Webinar on Glossaries and Classifications in OpenMetadata](https://www.youtube.com/watch?v=LII_5CDo_0s)
Learn about the classification tags, system tags, and mutually exclusive tags.
Add tags to data assets, or request them and discuss about the same, all within OpenMetadata.
Users can request to update tags and discuss about these tags within OpenMetadata.
Learn how OpenMetadata identifies PII data and auto tags or suggests the tags.
Tiers helps to define the importance of data to an organization.
Here are the Best Practices around Classification.