# Types of Categories

In IDOL Server, a category is a definition of a concept or topic. IDOL Server can analyze the content of documents, and assign documents that match the definition to that category.

The Categorization section describes how you categorize documents, and you can use categorization to enrich your documents before you index. This section discusses the different types of categories and how you might use them:

- Conceptual Categories.

- Binary Categories

- Simple Categories

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