# Preferences

## Overview

The **Preferences** module provides APIs for key-value (KV) data processing, including querying, modifying, and persisting KV data.

**System capability**: SystemCapability.DistributedDataManager.Preferences.Core

**Since**: 13

## Files

| Name                                                      | Description                                                        |
| ---------------------------------------------------------- | ------------------------------------------------------------ |
| [oh_preferences.h](capi-oh-preferences-h.md)               | Provides APIs and structs for accessing the **Preferences** object.                   |
| [preferences_err_code.h](capi-oh-preferences-err-code-h.md)   | Defines the error codes used in the **Preferences** module.                        |
| [oh_preferences_option.h](capi-oh-preferences-option-h.md) | Provides APIs and structs for accessing the **PreferencesOption** object.|
| [oh_preferences_value.h](capi-oh-preferences-value-h.md)   | Provides APIs, enums, and structs for accessing the **PreferencesValue** object.|