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# SRSupplementalCategory

A more detailed category that provides additional context to the app category.

```
class SRSupplementalCategory
```

## Overview

Use a supplemental category to interpret the detailed relationships of app usage data within a [`SRDeviceUsageReport`](/documentation/SensorKit/SRDeviceUsageReport). The device usage report contains high level primary categories defined by the [`SRDeviceUsageReport.CategoryKey`](/documentation/SensorKit/SRDeviceUsageReport/CategoryKey), which are then broken down into more specific descriptions with the supplemental category. Each category maps to a unique [`identifier`](/documentation/SensorKit/SRSupplementalCategory/identifier), which you can access with the [`supplementalCategories`](/documentation/SensorKit/SRDeviceUsageReport/ApplicationUsage/supplementalCategories) property and group the app usage relationships.

Use this [table](https://developer.apple.com/download/files/SRSupplementalCategoryTable.zip) to access this supplemental category. It’s organized with the identifier that maps to a set of related words called *representative words*. For example, if you’re tracking usage within apps in the Games category, use the cluster UUID with representative words like *puzzle*, *gameplay*, *addictive*, and so on to track the specific types of apps and common descriptions within Games.

> Note: These representative words are subject to change in future releases, that’s why each table is associated with a version number that helps you keep track of the categories you use.

## Topics

### Identifying the category

[`identifier`](/documentation/SensorKit/SRSupplementalCategory/identifier)

A unique identifier for the supplemental category.


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