> ## Documentation Index > Fetch the complete documentation index at: https://docs.scoperag.com/llms.txt > Use this file to discover all available pages before exploring further. # Categories and classifications > Set up categories, classification ranks, and tags for documents and chat filters. Categories, classification levels, and tags are how files are organized and how chat filters work. ## Categories Open **Admin Center** → **Categories**. Build a tree that matches how the organization thinks about knowledge (teams, products, regions, or policy types). Documents always belong to at least one category. If an uploader picks none, ScopeRAG uses **Uncategorized**. Plan limits cap how many categories you can create. Owners and administrators can also add a category from the Documents sidebar. ## Classification levels Open **Classifications**. Each level has a **name** and a numeric **rank**. Higher rank means more sensitive. Example: | Name | Rank | | ------------ | ---- | | Public | 0 | | Internal | 10 | | Confidential | 20 | Assign every uploaded file a level. Groups use a level as the maximum their members may read. ## Tags Tags are free-form labels on documents. They do not grant access. They are useful in chat filters when you want a cross-cutting topic (for example `q4-policy` or `onboarding`) that is not a category. Create and attach tags while uploading or editing a document. Changing a category or classification later does not automatically rewrite past chat answers. New questions use the updated metadata.